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The Basics of Charging LiFePO4 Batteries

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Following your decision to purchase LiFePO4 batteries, the logical next step is determining what other components your system will need. Among other accessories, having a charger that is compatible with your batteries is essential. Understanding how to determine the right charger for your Battle Born LiFePO4 batteries can be a daunting task. To tackle this challenge, we will dive into the basics of charging lithium batteries. 

What Happens When You Charge a LiFePO4 Battery? 

Battle Born Batteries Electrical System

When you charge a LiFePO4 battery, you are applying an external voltage to drive current from the anode to the cathode of the battery. The lithium battery charger acts as a pump, pumping  current upstream, opposite the normal direction of current flow when the battery discharges. 

When the charger’s applied voltage is higher than the open-circuit battery voltage, the charging current flows. During this process, the battery’s open-circuit voltage increases, approaching the applied voltage of the charger. 

The Difference Between Bulk and Float Charging 

Lithium battery chargers can behave in several different ways during the charging process. First, the charger can steadily increase its voltage in order to keep the current flow constant. This is the first stage of the charging process – typically called the “bulk” charging stage. During this stage, the charger adjusts its applied voltage to deliver the maximum current to the battery. 

For example, a 10-amp charger will deliver its maximum of 10 amps during this bulk charging stage, and the applied voltage will increase up to a maximum voltage, or “bulk voltage.” 

Once the bulk voltage is reached, the charger enters a second stage, called the “absorption” charging stage. During absorption, the charger applies a constant voltage called the “absorption voltage.” As the battery’s open-circuit voltage approaches the absorption voltage, the current flow steadily decreases down to zero. 

At this point, the battery is fully charged. However, a lead-acid battery will rapidly lose charge when the charger is disconnected. So, instead of turning off, the battery charger enters a third stage called the “float” stage, in which the charger drops to a lower voltage and holds at that voltage. The point of this stage is to keep the battery topped off and account for the fact that lead-acid batteries tend to drain, even when there is no load connected. Float charging is not necessary for Battle Born LiFePO4 batteries. 

Battle Born Batteries Electrical System

What is the Charging Algorithm for a Battery? 

The bulk, absorption, and float stages combined sequentially form what is commonly called the “charging algorithm.” A battery charger may generally be classified by a charging current (i.e., the max charging current) and a target battery voltage (12 V, 24 V, 36 V, 48 V, etc.). But battery chargers may also include multiple charging algorithms (typically classified as “AGM,” “SLA,” “Gel,” “Wet,” etc.). A closer look reveals that each algorithm has its own unique parameters, including: 

  • Bulk voltage
  • Absorption voltage
  • Absorption time
  • Float Voltage 

There is a wide variation among values for charging algorithms for lead-acid batteries. The bulk and absorption voltages typically vary between 14.0 and 14.8 V, and the float can vary between 13.2 and 13.8 V. 

The 12V Battle Born Batteries sit comfortably right in the middle of these ranges. We recommend a bulk and absorption voltage of 14.4 V. A float is unnecessary since lithium-ion batteries do not leak charge, but a floating voltage under 13.6 V is fine. 

Frequently Asked Questions About Charging Lithium Batteries 

How can I charge a LiFePO4 battery? 

When choosing a device to charge your LiFePO4 battery, it is essential that it is compatible. Determining a charger’s compatibility comes down to ensuring your charger’s parameters match that of your battery. For Battle Born lithium batteries, you want to ensure that your charger offers between 14.2-14.6 Bulk/Absorb and 13.6 Float. If these specific parameters are offered, a variety of chargers will work with your lithium batteries.  

Although you don’t need to purchase a specific charger for Battle Born LiFePO4 batteries, it is essential that you check that your charger has compatible parameters. When evaluating the compatibility of your charger, check that it allows for between 14.2-14.6 Bulk/Absorb and 13.6 Float. While our batteries do not require float charging, many devices used to charge other types of batteries that have these parameters will work for a Battle Born Battery as well.  

Do I have to buy a special charger for LiFePO4 batteries? 

How long do Battle Born Batteries last? 

Through extensive cycle testing, we have determined that, after 3,000 full discharge cycles in extreme conditions, our lithium batteries will have 75%-80% battery life left. For the average user not operating their battery in extreme conditions, they will have 75%-80% battery capacity after 5,000 cycles. If you were to fully charge and discharge your Battle Born Batteries every day, they would last you between 10 and 15 years. With a 10-year warranty, our lithium batteries will keep you powered for years to come. 

Charging LiFePO4 Batteries in Cold Weather  

After you’ve selected a compatible charger for your LiFePO4 battery, it’s important to prepare your electrical system for the variable conditions it may face. While some campers prefer to follow the 70-degree line, others want to experience a range of seasons. If it’s possible that you will encounter below-freezing temperatures while using your Battle Born lithium batteries, be sure to prepare your system ahead of time to avoid any loss of power or low voltage disconnect. 

Cold weather can impact a battery’s ability to store and release energy. Without heated battery kits, a reduced energy transfer affects the battery’s efficiency by lowering its capacity, performance, and lifespan. Protecting your battery from the cold is necessary to prevent freezing, cracking, and long-term damage and to ensure reliable performance. 

Battle Born Batteries in the Snow

To protect your Battle Born LiFePO4 battery in cold weather, its temperature needs to remain above 35°F. With our heated battery kits, you can have peace of mind knowing that the internal temperature of your batteries will never drop below freezing. Our deep cycle LiFePO4 heated batteries use a proprietary, low-draw technology to keep batteries at an optimal temperature and ready to charge. This ensures your adventures won’t stop, no matter what weather you encounter.  

Want To Learn More About Electrical Systems and Lithium Batteries

We know that building or upgrading an electrical system can be overwhelming, so we’re here to help. Our Reno, Nevada-based sales and customer service team is standing by to answer your questions! Reach them at (855) 292-2831 (M-F 8:00 am – 4:30 pm (PST)) or email [email protected]. 

Also, join us on Facebook, Instagram, and YouTube to learn more about how lithium battery systems can power your lifestyle, see how others have built their systems, and gain the confidence to get out there and stay out there. 

Want To Learn More About Electrical Systems and Lithium Batteries?

We know that building or upgrading an electrical system can be overwhelming, so we’re here to help. Our Reno, Nevada-based sales and customer service team is standing by at (855) 292-2831 to take your questions!

Also, join us on Facebook, Instagram, and YouTube to learn more about how lithium battery systems can power your lifestyle, see how others have built their systems, and gain the confidence to get out there and stay out there.

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112 thoughts on “The Basics of Charging LiFePO4 Batteries

  1. Hello,

    Do you sell smaller batteries? I am looking for something in the range of a 50ah, 12V battery.

    Do you ship to Vancouver, Canada, and can you supply an estimated shipping cost?

    Thank you,


  2. What is the reserve capacity of your batteries? I may not be using the correct term but battery manufacturers often specify the amount of total capacity available before there is significant voltage drop. I know this capacity is typically much better with LiFe batteries – sometimes 90%. Can you provide similar information about your batteries?

    1. Hello Crosby,
      Our batteries don’t necessarily have a reserve capacity that is more of a term used with lead acid batteries, but you are able to use a full 100% of the batteries capacity. please give us a call if you have any other questions.
      775 221 8897

  3. When charging a smaller ah lithium battery such as a 7 to 9 ah do you use the same settings on a programmable ac/dc power converter as you would on a larger ah lithium battery?

    1. Depends on the chemistry. Best thing to do is contact the mfg of the battery and ask them for the charging parameters.

    1. Hi there, I will include the criteria of amperage level for our batteries:
      100 Amp Continuous Current
      200 Amp Surge Current (30 Seconds)

      If you have any questions, please let me know. You are welcome to reach us at info@battlebornbatteries or give us a call at 855.292.2831. Thanks!

      1. Seems you are you saying you can charge BB 100ah batteries at 100 amps? I thought the answer was a maximum charge rate of C/2. Please advise

        1. Hi Bob, thanks for your patience at this time. In regards to both of your questions, the BMS current limits apply to the discharge only and not the charge rate. The BMS will allow for a 100 amp continuous discharge, 200 amp discharge for 30 seconds and a higher discharge for a 1/2 second. It does not limit the charge current. Our suggested charge rate is 50 amps max for a single battery, but be aware that the battery can accept a higher charge rate if this is needed by the end user. We don’t limit this in case the end user needs to apply a quicker charge to the battery based on their specific scenario and aren’t worried about the potential shortening of cycles that can occur by this higher charge rate. Please let me know if you have any additional questions.

          1. Hi Garret, our recommended charge rate is 50 amps per 100 Ah battery in your system. For example, if your charger is 20 amps and you need to charge an empty battery, it will take 5 hours to reach 100%.

            We don’t recommend you exceed this charge rate as it can lead to a shortened battery cycle life. In an emergency situation the battery can be charged at a quicker rate if needed. All in all, the length of time it takes to charge a li-ion deep cycle battery depends on the type and size of your charging source. You can find more answers to charging questions at our FAQ page here: https://battlebornbatteries.com/faq/

  4. Hi
    I could be wrong, this is what I learned : problem with a”normal” RV battery charger is,:having a float mode?

    1. Zoltan,

      That’s a good questions. Our batteries do not require a float charge. But they can be in float mode as long as the float is around 13.6, it is OK for the batteries to float around that voltage.

      1. Is it ok to float at 14.6 volt
        That is all I can get my charge controller to do
        That is also the bulk charge

        1. Hello, can I charge two batteries connected in parallel with 1 charger to charge my batteries? Or do I need 2 chargers? Also, this would be at the same time my 20amp solar charger would be charging as well.

          1. Good morning Chris! Thanks for reaching out. Your system will be completely fine with one charger if it’s all wired in parallel. Please let us know if you have any additional questions!

  5. We currently use 2 external Alphacell 220 GXL 109AH batteries in serial, connected to an APC Smart-UPS 700. We are looking to replace the 220GXL batteries but keep the APC-UPS. We remove the internal battery from the APC-UPS. Will a LiFePO4 battery work in this instance as a replacement for the Alphacell 220 GXL lead acid batteries? We have to replace about 20 of these batteries.
    In some instances we use a single 220 GXL connected to an inverter and a standard marine battery charger. This is then connected to a transfer switch which switches from wall outlet power to inverter power in the event of a power failure. Can the LiFePO4 batteries be charged with a standard marine battery charger ?

    1. Hello Jim,

      lithium batteries power 12 volt devices with the proper voltage just as a regular lead acid battery so running devices will not be a problem. Charging Lithium batteries requires a voltage in between 14.2-14.6 volts for bulk/absorption, 13.6 or lower for float and should not have an equalization stage. Typical lead acid chargers can work in some instances but we would have to get the model # for your marine battery charger and check the settings for compatibility. Please give us a call at your earliest convenience so we can go over the details. 855-292-2831

      Thank you,

  6. The Pb battery chargers I know of have a fixed absorption time (which may be programmable) BUT it seems that the best way to charge a Li battery is to switch from absorption to float when the charging current reaches a prescribed value, so I have 2 questions: Do you know of any PV powered chargers that can switch from absorption to float using a external signal (logic level input) and if using a constant but programmable absorption time, what is a good time (for a specific voltage)?

    1. Hi Wayne,

      The Victron MPPT charge controllers allow you to set the absorption time(and voltage 14.4v) to the desired level. In the case with our lithium batteries its about 20 minutes per battery. You can also set the float voltage to the recommended 13.6v after the absorption time is achieved.

      Thank you,

  7. I frequently use my RV in below freezing conditions in the winter. I plan on an inside, normally heated battery location, however, their are times when the battery temp might drop below freezing. I understand that your internal BMS has a low temp disconnect to prevent damaging the cells when charging when the batteries are too cold. Could you elaborate on the process of the disconnect/reconnect if this occurs.. In my application would you advise that I add external charger disconnects to prevent accidental charging, such as from solar panels, until I’m sure the battery warms above freezing? Or will the BMS provide this function?

  8. I have 6 12V 200AH lithium ion batteries, and I was wondering what would be the best way to charge them all at once, and how many Amps and volts my charger would have to put out to charge them in at least 10 hours from being completely depleted.

    1. Hello William,

      We don’t make 200AH batteries, so I’m assuming these are another manufacturers batteries. I would check with your battery manufacturer to answer this question for you. I can only speak for our 100AH batteries.

  9. Recently installed my 2 100AH Battleborn Batteries in my RV and programmed my solar and inverter/charger to your recommended specs. In case you missed my earlier post, regarding the low temp disconnect of the internal BMS. My question is weather you recommend I install additional charger disconnects to protect the battery from charging in freezing conditions or is the BMS designed to disconnect and reconnect when temp rises to a safe level. Thanks.

    1. Hello John,

      The BMS is programed to handle temperature compensation. No need to add a battery disconnect for charging. When the BMS senses the temperature is below 25 degrees F, it will not let the battery accept a charge. Once the temperature is back up above 25 degrees F, the battery will be able to accept a charge again.

  10. What percent increase in battery life would you expect if your battery were only charged in the range 25-35F vs only charged in the range 35-45F?

    1. James,

      The colder the temperatures you are charge in, the less life expectancy you will incur. We don’t have a specific % increase or decrease calculation for these temperatures but around 70F is optimal for maximum life expectancy.

      Thank you,

  11. Sorry I forgot to include my name and email on the first comment I sent.

    I just received 3 of your 100 ah 12v batteries, do I need to charge them before installing or using them?

    If I decide to add another in a few months, are there any special procedures that I need to follow?

    1. Hi Jeff,

      We always recommend charging the batteries completely before the initial use. This becomes even more important when connecting batteries in series.
      Adding another battery in the future will not be an issue, again just bring all the batteries to a full state of charge before using.

      Thank you,

  12. Hello
    can I leave my rv plugged into shore power for an extended period of time with out harming the batteries.

    1. Hi Tim,

      If you are storing your rv and wish to have it plugged in, we would recommend a float voltage of 13.6 volts. If you have a higher voltage applied in float(such as 14.6) then we would recommend that this be no longer than 3 weeks at a time.


  13. What would be considered the resting voltage of a fully charged Lithium battery, with no load connected? I’m trying to ascertain if my (non-Battleborn) battery has a bad cell, or a bad bms. Thanks~

    1. Hi Laura,

      The resting voltage of a fully charged Battle Born Battery is 13.5 to 13.6 volts. You may want to contact the manufacturer of your other lithium battery to see if it is the same per their specs.


  14. Hello,

    Can the Battle Born 100ah lithium 12V batteries be charged off of the alternator using a battery isolator? I assume as long as the max output of the alternator does not exceed 100amps of continuous current?

    1. Hi Mark, Yes our batteries can be charged off of the alternator using the Battery Isolator within our Accessories. Give us a call for more information on this, 855.292.2831! Thank you and have a great day.

  15. Hello,

    I have a 2018 Toyota Rav4 hybrid, I am considering replacing the original 12v Aux. battery with your Lith. Battery. Or adding a 2nd battery, (yours), wired in parallel or connected to the load and separately connected to the car through say the 12v cigar lighter. I do know not much about the Rav4 hybrid elect. system except that it does not have an Alt. but charges the Aux. battery from the Traction battery. The charge Amp. is low 15 or less. in normal driving it seems to stay at 14.2v.

    Would your batteries work under either or both senarios, or what changes should should I make to accomplish either?

    1. Hi Russell,

      There are many different factors in play with this system and it will require a phone conversation in order to work out the details.

      Please give us a call at 775-622-3448


  16. I have a Magnum hybrid inverter with the ME-BMK. In setting up the BMK, it ask me to set the “charge efficiency factor” from the Battery manufacturer or leave it the in auto default. This setting provides an accurate SOC result.

    1. Hi Terence, you can get the full amount of power out of our batteries compared to lead acid ones. Our charge efficiency factor is 100%. Thanks for your comment!

  17. I am looking at sterling power 30 and 60 amp dc to dc chargers. Advantages or disadvantages to either with your batteries. I have a 2-100ah bank.

    1. Hi John, both are great options but the 60 amp is faster. It would charge the 200 ah bank in a little over 3 hours while the 30 amp would do it in 6 hours. If you have any other questions or want to talk about all things batteries, you can call our team at 855-292-2831. Thanks for reaching out!

  18. I would like to convert my wet cells to a low maintenance battery for my home solar system. I currently have 8 ea 6vdc battery hooked in series for 48vdc. The battery’s are the Trojan L16H-AC w T2 technology
    435AmH . My question is what maintenance free will provide the 48vdc and the capacity the 435AmH batteries have in series And can I use my existing inverter/converter/charger system? I am looking for a drop in replacement to my wet cells that will meet my 60amp A/C requirement, thank you.

    James from Mojave Ca.

    1. Hi James, please give us a call at 855-292-2831 so we can confirm everything and run through your system. Thanks for reaching out!

  19. If someone hasn’t spoken the obvious. This article was suppose to be talking about charging lifepo4 batteries but it instead talks about lead acid battery charging.

    I was hoping to actually get information on charging lifepo4 under various conditions like cold. etc. and how the lifepo4 algorithm is set up.

    1. Hi Corey, thanks for your feedback! If you want to get more information about these various conditions you can give us a call at 855-292-2831 or email us at [email protected] and one of our sales and tech specialists can help you. As for the article, we are currently rewriting these blogs and creating a new FAQ series, so stay tuned for those updates.

    1. Hi Corey, thank you for bringing this to our attention. We are currently in the process of revamping our FAQ videos so it is certainly something that we will keep in mind throughout.

  20. I hope to use a 12v 100ah battery in my van and intend to use a DC – DC charger. The charging volts are rated for up to 15.3 and the amps are either 25 or 50. Is there an upper limit to the charging amps the battery can handle safely? Would the 50 amp charger be safe?

    1. Hey Ernie! Yes, the 50 amp charger will be safe for it. The upper limit for the charging amps that the battery can handle safely is 14.8 and after that you’d have to adjust the charge so it doesn’t permanently damage the battery.

    2. 15.3 volts will destroy your batteries, keep it at 14.4v or below. it’s better to charge your bank at less than 100% for longevity. 14.1 volts would be fine to set it to

  21. If you have a Sterling DC to DC charger (30 amp) For a 6 x100 BB battery bank will it cause damage? I know it will take longer to charge, but want to make sure it won’t damage the batteries. Most of the time if it is warm I will be plugging in at night and the Victron Multiplus 3000 can charge the batteries.

    1. Hi Jason, no damage will occur with the Sterling 30 amp charger on a 6 battery bank, but it will take longer to charge.

  22. I’m so confused. I’m trying to understand the best way to charge a Lifepo4 battery from my alternator. I understand the reasoning for using some type of DC-to-DC charger/converter but …..

    I have a lifepo4 with a BMS and trying to charge via alternator in my truck.

    I see on your recommended chargers you have the Victron TR-smart DC-to-DC chargers and also the Victron DC-to-DC converter.

    So…. If I want to use a converter, how would I manage the charging profile for a lifepo4 for bulk, float, etc.? Does the BMS control that or ?????

    The charger has a lifepo4 setting but the converter can only charge at a constant voltage.

    What’s best and what do you recommend given you sell both products?

    1. Hi Kevin, there are a few differences between the Victron 12/12 – 30 converter vs the Victron 12/12 – 30 Smart Charger. The 12/12 converter is geared towards the use of a non-smart alternator. This unit has a simple rotary dial that the output voltage can be set to; we recommend 14.4v for Battle Born Batteries. There is no actual charge profile on this unit, and the maximum wire gauge recommended is 10 gauge. The 12/12 Smart Charger is more versatile and works with smart/non-smart alternators. The unit has a three stage charge profile with bulk, absorption, and float. These parameters can be customized for Battle Born Batteries with the use of the Victron Connect App as it’s a Bluetooth enabled device. The maximum recommended wire gauge is 6 gauge for this unit.

      For alternator charging, we recommend using the Victron 12/12 – 30 Smart Charger for a number of reasons. This will allow you to set a specific charge profile compatible with our batteries, and will ensure proper charging. These units will regulate the amount of current, and also act as an existing isolator. Since it is Bluetooth enabled, you are also able to see some charging information on the app as well.

      The BMS does not regulate incoming current, which is why there is a need for a DC to DC charger to regulate flow of current from the alternator to the batteries. If you have any other questions or concerns, please give us a call at 855-292-2831 or send an email to [email protected].

  23. Smoke and mirrors to distract from the challenges of low temp LFP charging.

    The imposition of the 12.2V disconnect for AGM is completely absurd. You explain Peukert, and you are familiar with that dude… you know.. Ohm and his law. You KNOW this is flawed. 12.2V is 50% SoC for a battery that has been sitting at rest for an extended period, typically 24 hours.

    You should have discharged to 10.5V and used half the tested capacity.

    When you charged the AGM in the freezer, did you use temperature compensation? At the coldest temp, you’d be at almost 16V for a proper absorption charge.

    Sure, LFP is a superior chemistry in almost every way, but you don’t need to manufacture misleading data and masquerade it as something scientific to poo poo AGM.

    Do better.

    1. Hi Steve,
      We believe you are meaning to respond to our white paper blog. You can find the blog here: https://battlebornbatteries.com/lead-is-dead-white-paper-study/
      And the white paper study itself here: https://battlebornbatteries.com/wp-content/uploads/2020/10/Lead-is-Dead-Cold-Charging-LFP-vs-Lead-Acid.pdf
      We appreciate you bringing up the point of the 12.2V cutoff. It is in fact a higher cutoff, but after reviewing the AGM battery manufacturer’s load voltage versus DOD chart and calling manufacturers for their recommendations, we chose to stick with this cut off to reflect what the average system is programmed with.
      This test was meant to demonstrate the functionality of a real world system with AGM versus lithium. We do acknowledge that some customers are aware of temperature and load effects on the AGM battery cutoffs, but a vast majority do not know or do not update their programming to reflect this based on their given circumstances.
      You are correct that we could have discharged to 10.5V to find the proper 50% DOD. The issue with this is that this would drastically limit the AGM battery’s life cycles available to the user. We modeled this test as if we were end users wanting to preserve our life cycle count of our batteries. According to research performed by Lifeline, if you discharge your battery to this depth you could stand the risk of reducing your total available life cycles from 1000 to 275 cycles.
      In regard to the temperature compensation, we modeled this experiment after a typical customer experience, so temperature compensation was not included, as most customers would not implement this in their own system.
      We did not intend to present misleading data, we believe that the LFP chemistry’s performance speaks for itself as to why it is a viable option over AGM. Our team is reviewing our verbiage to make sure we better reflect this. Thank you again for your valuable feedback.

  24. Your manual states… “For your Bulk/Absorption stage, the ideal voltage is between 14.2v-14.6v.” This suggests a fixed voltage, rather than a current limited bulk stage. What is the maximum current I might expect your BB10012 to draw with 14.6V applied (likely when it is fully discharged)?

    I’m running with a Progressive Dynamics PD4575LI which always/only outputs a fix 14.6V, and does not apply a proper bulk charging stage.

    Please post/share a table or graph of charge current vs. state of charge for fixed charge voltage, such as 14.6V.

    Thank you for a solid blog/forum page.

    1. Chris,

      Charging parameters can be a bit tricky at times and vary depending on the charger and how many stages it allows for. In your case, having a constant 14.6V is acceptable for the batteries but the batteries don’t necessarily draw power from your charger, they will accept whatever amount of charge your charger puts into them. As a result of this, we recommend that you do not exceed our 0.5C charging rate requirement. This means that for every 100Ah of your bank, the maximum charge rate should be 50A. Your charger seems to be a 75A charger and if that is the case, it is recommended to use this with a battery bank of 150Ah or higher. Exceeding the 0.5C charge rate can prematurely wear down the life cycles of your battery which is why we recommend staying within this specification. If you have any additional questions please give us a call at 855-292-2831.

      Thank you!

      1. Thanks for the info. Turns out that under load the converter output drops down from the no-load 14.6V. One measurement I have is 45A into the battery at 13.85V, but I don’t know the state of charge. Also, in my application there is a 50A circuit breaker between the converter and the battery. I’ll keep an eye out for excess current which trips the breaker.

      2. Another data point… I drained off about 85 Ah (1050 Wh) from a full charge. The battery voltage had dropped to 11.5V with the load switched off.

        I then turned on the PD4575LI converter. The initial charge condition was 12.2 V at 58.6 A. At 5 minutes of charging, 13.26 V at 50 A. The 50 A circuit breaker did not trip. Charging completed in about 2 hours with 1150 Wh in. The final charge conditions was 14.65V at 270 mA.

        Sound reasonable? Any concerns?

  25. I have a pd4655 liv and a 3210an Epever Tracer for my 100 amp Battleborn. I also have a Tri-metric 2025 -A. Sometimes we use campgrounds where we are hooked up to shore power for a number of nights and other times solar is our only source. If I am using shore power I expect the battery charge to quickly get to 100% and if I get reasonable solar, the battery should reach 100%. I have a 100 watt panel on the roof and another 200 watts in a portable suitcase in case I need it, and for emergencies, a 2000 watt Yamaha inverter generator.
    I understand that the best SOC is between 20% and 95% to maximize the life of the battery. What can I do to limit the SOC to those parameters or is this something that is not worth worrying about and the BMS in the battery will take care of it?

    1. Hi Don, thanks for reaching out! Ideally we want our battery to regularly reach a 100% SOC. The reason is we have designed the BMS to employ passive balancing at the top of the charge cycle. This means that the battery needs to regularly hit at least 14.2 volts (100% SOC) in order for the cell modules to balance internally. This will offer a battery that can offer maximum capacity along with even charge and discharge. We wouldn’t have you limit the SOC to these parameters as the battery can be safely discharged to 0% SOC and we regularly want the battery to reach 100% SOC for balancing purposes. If you have any other questions, feel free to give our sales and tech team a call at 855-292-2831 or send them an email to [email protected].

  26. Thank you so much for the content on batteries! It is super helpful to know the inter-workings of the batteries and charging. I have been doing some research on battery restoration and I think this content may help anyone looking into this product for more help – https://bit.ly/3nlQMN8

  27. What are the recommended settings when using Magnum’s ARC50 charge controller?
    Battery Type?
    Absorb done?
    Max Charge rate?
    Max Charge Time?
    Final Charge Stage?
    Do you have a setup sheet listing all of the various setting for the ARC50 controller?

    1. Hi Jim, thanks for reaching out. Our team suggests the following settings:

      Scroll through the menu options until you reach “Setup” then press to select

      Scroll through setup options until you see “03 Charger Setup” then press to select this option

      Scroll through options until you see” 03C Battery Type” then press to select

      You should see “Set Battery Type” then scroll until you come to “CC/CV” then press to select this option

      It should now show “Set max charge Amps” and scroll until you reach the appropriate amperage. To figure out the appropriate amperage divide the capacity of your battery bank by 2 (For example if you have a 200Ah bank, select 100A). Once you’ve scrolled to the correct number press this setting to confirm.

      It should now read “Set CV Charge Volts” and scroll until it reads 14.4V then press to confirm this.

      The screen should now say “Set CV Chg Done Time” then press to select this option

      Now it should say “Set CV Chg Done Time”. You will need to scroll to set the appropriate amount of time. To figure this time out we recommend 20-30 min per battery (For example if you have 2 batteries set it for 1 hour). Once it reads the correct time, press to confirm

      You should see “Set Max CC/CV Time”, press to go to the next option

      It should now read “Set Recharge Volts” and scroll until it reads 13.3V. Press to confirm.

      Please let us know if you have any additional questions. Our sales and tech team is more than happy to help as well, if you give them a call at 855-292-2831 they can walk you through the process live as well.

      1. I have this same setup, with 6 – 100Ah batteries and a Magnum inverter/charger. I just reviewed the instructions above and confirmed that I have set everything correctly (a year ago when I installed the system.) But you seemed to skip over “Set Max CC/CV Time, ” implying that it should be left at a default value. Mine reads 12.0- hours – is that correct? The motorhome is on shore power most of the time, so it can be months between the batteries being called upon – but they have always worked when needed. My concern is that the ARC-50 display almost always shows the status as “Constant Voltage DC 14.3V.” Very rarely do I see the status as “Quiet 13.6V.” It seems I’m holding the batteries at high voltage way too much. Shouldn’t they be resting/floating most of the time? Thanks.

        1. Hi Chuck, I apologize for the delay in getting back to you. I have passed along your email to someone on our sales and tech team to assist with your system troubleshooting.

        1. Hey Chuck! Thanks for reaching out.

          The RC remote is pretty basic remote but you can set it up just like the more advanced remote (ARC50) The parameters are the same:
          Scroll through the menu options until you reach “Setup” then press to select
          Scroll through setup options until you see “03 Charger Setup” then press to select this option
          Scroll through options until you see” 03C Battery Type” then press to select

          You should see “Set Battery Type” then scroll until you come to “CC/CV” then press to select this option

          It should now show “Set max charge Amps” and scroll until you reach the appropriate amperage. To figure out the appropriate amperage divide the capacity of your battery bank by 2 (For example if you have a 200Ah bank, select 100A). Once you’ve scrolled to the correct number press this setting to confirm.

          It should now read “Set CV Charge Volts” and scroll until it reads 14.4V then press to confirm this.

          The screen should now say “Set CV Chg Done Time” then press to select this option

          Now it should say “Set CV Chg Done Time”. You will need to scroll to set the appropriate amount of time. To figure this time out we recommend 20-30 min per battery (For example if you have 2 batteries set it for 1 hour). Once it reads the correct time, press to confirm

          You should see “Set Max CC/CV Time”, press to go to the next option

          It should now read “Set Recharge Volts” and scroll until it reads 13.3V. Press to confirm. Alternatively, if you don’t want to or can’t use the custom settings then they can just set the retome to the “AGM2” battery type and it will still work well to charge our batteries.

  28. Hi! I have two 100amp 12V battleborn batteries in my van. I moved to the mountains in Colorado and with negative and below freezing temperatures common at night, the batteries have been turning off—rendering my van a large cooler! I read above in response to comments and in the manual that they have the sensor that will shut off the current to the battery when its less than 25 degrees. This happens OFTEN in the winter in CO; what do you recommend to keep the batteries working, warm and functional?

    1. Hi Christine, thanks for reaching out! We are so sorry to hear that this is happening to your rig. You can install a DC light fixture with an incandescent bulb if the compartment is well insulated or use a warming pad to keep the batteries above freezing. You also can consider getting our newest heated battery as well. If you have any other questions please feel free to give us a call at 855-292-2831 or send an email to [email protected].

  29. An earlier question asked if batts should be fully charged before use, and the answer was yes. It’s currently winter and I’ve got my camper covered and stored. If I want to charge them now in my home to verify they are ok when I receive them from BB, what is the suggested way to charge them? Trickle charger or something else?

    1. Hi Jeff, thanks for your comment. With our LiFePO4 batteries, we recommend disconnecting all potential power draws from the battery and letting them sit with a full charge, or at least a 50% charge minimum. On a full charge, our batteries have been proven to last at least a year in proper storage conditions with a 2–3% depletion each month. If left at a half charge, the batteries have the potential to not last as long in storage.

      If you are storing your entire system, we recommend the use of a battery guardian to help protect your batteries by disconnecting them from parasitic loads once they reach a voltage of 11.5V. We recommend removing the main battery connections if a disconnect switch is not incorporated in your system since our batteries do not require a trickle charge.

      We also are publishing an FAQ blog post on winterizing your batteries later this month, so stay tuned. If you have any additional questions please give our sales and tech team a call at 855-292-2831 and they can walk you through the charging process if necessary. Thanks again and have a great day!

  30. Is it detrimental to leave my BB 100ah batteries on an active solar charger (with properly set bulk/absorb/float parameters) for long periods of time, like for 6 months? The batteries will have effectively NO load on them, and will always be at 100% SOC. I have seen suggestions that holding the batteries at 100% SOC for long duration will impact the battery lifetime – is this true?

    1. Hey Bob, it will not be detrimental for your batteries. They can be left for many months at a time with the proper multistage charger available. In this case a charger using 14.2-14.6 volts for the bulk and absorb and anywhere between 13.4-13.8 volts for the float is fine. Our only concern would be a higher fixed voltage for an extended period of time at 14.2 or greater. Thank you for reaching out and let me know if you have any additional questions.

  31. The BMS will not allow current that exceeds 100 amps for 30s, or 200 amps for 0.5s. Does this apply to both discharge and charging currents? And a follow on question is: why doesn’t the BMS limit the charge current to the recommended C/2 (50 amps for the 100ah battery)?

  32. Good Morning,
    I sent in some questions yesterday evening & just after I hit send my computer crashed and so I am not sure if you received my questions.
    I am just completing the installation of six BB10012 batteries in my boat. They are all connected together for one 12v bank. I have moved the alternators to the start battery & a Sterling Power BBW12120 will charge the BB10012 house bank when underway.
    When I am running the generator or on shore power the batteries will be charged by the Outback FX. Now the settings are: Charger AC in: 14amps, Absorb 14.2v, Absorb time 1hr (Increase to 3hr@anchor & 0hr when I leave town) Float 13.5v, Float time 3hr, [email protected], Eq 14.4v, Eq time 0.0.
    I live on the boat when I am in Seattle & so there will be a DC load (Lights, Refrigerator, Diesel heat) while I am onboard, but I also leave the boat unattended for several months at a time while I am out of town for work. What do you suggest I set the charger to for the BB10012 batteries? Should I make changes for when I am living aboard to when the boat is unattended?
    Thank you for your help.

    1. Hi Hugh,

      Thanks for reaching out! Thank you for your patience as well. Our tech team suggests that there are no additional steps that are necessary as long as there is no power applied to the unit when unoccupied. If you have any additional questions please give our sales and tech team a call at 855-292-2831 or send an email to [email protected].

  33. I have two 100ah Battleborn batteries in parrallel. when charging with an IP65 Victron 12v/15A smart charger do I charge each battery individually or do I connect the negative charging alligator clip to one end of the battery bank and the positive alligator clip to the other end of the battery bank? I would also like to build a preset for Battleborn based charging settings using the 14.4v bulk/absorbtion charge volts with a float setting of 13.6v. What other settings might I need to follow such as times, tail, etc? Lastly when I charge the battery bank, I am currently using the Li-ion setting, I get a finished voltage of 14.2, is this the 100% SOC I should be setting my victron 500a/50ma shunt as the 100% level of battery charge? I have read many things saying 13.2v, I just want to set my shunt to the correct settings for full charge, so i can have accurate usage readings.

    1. I apologize in the delay of getting back to you with this answer. Please give our sales and tech team a call at 855-292-2831 if you are still having issues with your setup and they can offer resources for the IP65 Victron Smart charger.

  34. I just bought one of your 100AH batteries. I plan to use it for a trolling motor on a small car top boat. I am using a Progressive Dynamics Model PD9245C to charge a 12v Lead Acid backup battery bank for my home and I want to know if the same charger will safely charge the lithium battery. The charger has a desulfation mode that’s supposed to come on when it thinks the battery needs it and I understand that lithium batteries can be damaged by that. It’s my intention to charge the battery while checking it frequently and disconnecting it once it’s charged. I also have two of the old transformer based 12 volt chargers, a 6 amp Schumacher SE-82-6 and a 15 amp Everstart that I think are safe to use, but would like to hear it from you, if you know. I believe they will be slow and won’t be my first choice. And lastly, I have a 30 volt -10 amp regulated power supply that I think I can use with a voltage limit of 14.2 or so. Is that correct? Thanks in advance for your help.

    1. Hi John, thanks for reaching out. The Intelipower 9200 Charge Wizard chargers will work great with our batteries, but you need to use the 9200 Wired Remote Pendant to force the converter to output a proper voltage in the BOOST MODE. Here is the link: https://www.progressivedyn.com/rv/charge-wizard/pd92201-converter-status-remote-pendant/

      This will need manual interaction each time you want to fully charge the battery, and our team recommends doing it once a week or so.
      Please let me know if you have any additional questions and have a great rest of your day.

  35. so just wondering a ballpark charge time for 1 of your 100ah batteries with using a Renogy 12v 40A DC-DC charger.

    also what voltage setting would be the best for your battery? it has, 14v, 14.2v, 14.4v 14.6v

    1. Hi Andy, great question! The Renogy DC to DC charger should take around 2.5 to 3 hours to fully charge a 100 amp battery if there are no significant loads being drawn. This unit uses 5 dip switches for programming. You can use dip switch 5 to choose between lead acid battery types and lithium. Once dip switch 5 is set to lithium you can set the charging voltage to 14.4 volts with the other 4 dip switch positions. These positions are in the manual. You can call us at 855-292-2831 or send an email to [email protected] if you have any additional questions as well.

  36. Hey guys is it possible to get more than 100AH out of your batteries? I have a bank of two (BB10012) connected with a victron 712 battery monitor. I left the residential fridge on for a few days to burn the batteries down a bit and I pulled 220AH. My victron was at 0% SOC and the fridge was still running, drawing over 8amps. Is that possible? Am I missing a step with syncing the victron? It does it automatically and I have it setup per your recommendations. Thanks

    1. Hi Joshua, thanks for reaching out. Our batteries are able to reach more than 100Ah, so it is possible. If you have any additional questions please give our sales and tech team a call at 855-292-2831.

  37. I’m in the early planning stages of a remote, mountain-top (ham radio) communications site which I hope to power using off-grid solar. Switching voltage converters such as MPPT charge controllers can cause radio interference, so I’m exploring a very simple system using a relay run by the site’s main microprocessor. Here’s the thought:

    At sunrise, solar panels directly charge a 100-AH Batteborn through the normally-closed contacts of the relay. The panels cannot produce more than about 18 amps in full sun, well below the battery’s limit, and voltage will be held down by the battery. When the controller sees voltage reach 14.4, it will fire a pulse to turn on the relay, disconnecting the panels from the battery for the rest of the day. At sunset, the end of solar production will cause the relay to reset, ready for dawn the next day.

    This would prevent max SOC from ever exceeding about 85 – 90%, but I actually like that side-effect, since I don’t need the full capacity of the battery. I’ve used a similar system with an SLA in the past, although the lack of a float mode limited battery life. Would your LiFePo4 batteries be OK in such an environment? Anything to watch out for?

    1. Hi Paul, thanks for reaching out. I have passed along your questions to our sales and tech team and one of them will be reaching out to you via email shortly.

  38. A BMS of 100A, where it has specified that it charges with a maximum of 50 A, is affected if it is subjected to charging directly from the car where the alternator removes 130A? Or does it only take a maximum of 50 A?

    1. Hi there, thank you for reaching out and your patience is appreciated at this time. On our 100 amp-hour battery, the BMS is rated to 100 amps continuous, 200 amps for 30 seconds, and any higher loads for ½ second. You can find more information about our BMS at our FAQs here : https://battlebornbatteries.com/faq/ or give our sales and tech team a call at 855-292-2831 for them to assist. Please note that at this time we are currently in the middle of our summer sale, so tech calls are being limited to 10 minutes.

  39. Hi.
    I am currently using Balmar MC-614 regulator connected to 4 100Ah 12V LiFePO batteries in parallel. I have programmed the regulator with Bulk/Absorb at 14.6V and Float at 13.6V. Other than for basic setting for battery type to LiPO, kept all other settings default.

    Would this setting sufficient to charge at an optimum pace for maximum life of the batteries or should I be looking to change some other settings on the regulator?

    Originally I had an 100Ah Ecotrek system on my Roadtrek but after it had completely died, I had removed the enclosure and replaced them with Battlebors.

    Thank you,

    1. Hi Peter, those settings work perfectly for bulk/absorb and float with our batteries. If you have any additional questions about your Battle Born Batteries, please give our sales and tech team a call at 855-292-2831 and they would be more than happy to assist with troubleshooting.

  40. Hi,
    My charger does not have an absorption limit timer, ( you recommend absorption time to be 30 minutes) it only exits absorption stage on a low current.
    I mean : as current goes down in absorption stage, current reaches a programmable value (for example 5A) and then charger goes into Float stage. What current value would you recommend (since I can program it) ? I have a BB10012. Thank you

    1. Good morning Jean! Thank you for reaching out. What is the make and model of your charger? For now, you can set the absorption current between 3-5 amps. If you’d like, please give our sales and tech team a call at 855-292-2831 so they can further assist.

      1. Good morning Nikki, Thanks for your quick answer,
        My charger is a Abso Kisae DMT1250. Maybe I’m lucky, I had it set at 4 amps so far. Should I maybe measure absorption time @ 4 amps and then adjust +or- current value to get time closer to 30 minutes ?

  41. Hello,
    We recently purchased a new KZ Travel Trailer with a 12V refrigerator. Since we go off-grid for up to 5 days at a time, I have decided to upgrade to a lithium battery system. I have purchased a Renogy 200W portable solar kit, with a switchable LA-Li controller. The existing trailer converter is a WFCO 8955. I believe I need to change it to a WFCO 8955-LIs or a PD4655LIV. Is there a reason to choose one over the other?
    I am going to use either one or two BattleBorn 100 AH batteries. Do I need to get both now, or should I buy one and then add the other if needed?

    Thank you!

    1. Good afternoon Paul! Thanks for reaching out. Our tech team notes that either option will work, but they typically suggest utilizing a PD4655LIV. It’s a model that we also have in our store in addition to a lot of handy materials created to assist with the install process. Here is a video for the PD4655LIV that our team typically references: https://www.youtube.com/watch?v=OjN75eDG8RM

      Please let us know if you have any additional questions and have a great rest of your weekend.

  42. Hello Sir,

    Can this battery be stored for long times without charging itself? I’m thinking buying 4 packs to let them as spare. I’m not sure if I have to cycles them (charge and discharge) with a frequency. Will be nice if you could help me figured out this.

    Manny thanks
    Jose A.

    1. Hi Jose! Great question. On a full charge, our batteries have been proven to last at least a year in proper storage conditions with a 2–3% depletion each month. If left at a half charge, the batteries have the potential to not last as long in storage.

  43. Putting my Battle Born 100ah lithium 12V batteries in storage for the winter for the first time. Plan is to remove from RV and store in heated basement with a fully automatic smart charger set to lithium mode and the batteries connected in series with 20″ 6 AWG cables. Sound plan?

    1. Hi Craig! We recommend fully charging your batteries and then moving them to your basement and keeping them completely disconnected while in storage.

  44. The WF9855 converter in my RV states the bulk charge is 14.4v, absorption mode is 13.6v, and float is 13.2v. Is this charger inadequate? Will it harm a lifepo4 battery?

  45. In a warm climate, is there any reason not to connect a lead-acid battery and a LiFePO4 battery with a built-in BMS in parallel through a Blue Sea SI-ACR — if the charging systems are carefully set within the parameters you specify for your batteries?

    The charging comes from shore power, solar, and the alternator, all set to the recommended parameters and with temperature compensation disabled.

    It seems both batteries want the same voltages and the LA will stay fully charged until the LiFePO4 drops and the BMS will manage the LiFePO4. The LA will absorb any surges.

    The installation in question is a sailboat where the fridge and lights all run on 12V DC, so a constant float is necessary to power them.

    1. We do not recommend wiring our LiFePO4 batteries to lead acid batteries under any circumstances.

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