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All About Low-Voltage Disconnect

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Battle Born Batteries have been created with inherent safety precautions to ensure protection from dangerous operating conditions. One of these features is low-voltage disconnect (LVD). When your battery voltage drops below a safe limit, the BMS will shut the battery down before damage can occur. This ensures that your battery will remain functional and you will remain secure.  

Battle Born Batteries

What is Low-Voltage Disconnect?

Low-voltage disconnect (LVD) is a feature of our proprietary Battery Management System (BMS), wired internally inside all Battle Born Batteries. LVD and the other safety features programmed into the BMS  exist to protect your investment and preserve the life of your battery. When a Battle Born Battery is discharged, the BMS will detect if the battery’s voltage falls below 10V. If this occurs, the BMS will disconnect the battery and shut down all functions. This prevents any charge from leaving the battery, which protects it from damage.

Once a Battle Born Battery enters LVD, it will not dischargeToto get your battery functioning correctly again, it will need to be jumped with another 12V source to “wake up” the battery. To help preserve the battery’s lifespan, it should be “woken up” within five days of entering LVD. Leaving the battery at a 0% charge for too long can damage it and void your warranty.

How to Wake Up Your Battery from Low-Voltage Disconnect

Battle Born Batteries plugged into a multimeter

  1. To wake up a battery that has gone into LVD, disconnect all connections from all batteries.
  2. Wait for 30 minutes, and then check the voltage of each battery individually. Label each battery and write down the voltage.
  3. If a battery has a voltage over 11.5V, charge it with a lithium charger.
  4. If the battery’s voltage is below 11.5V, connect it to a car, just like you would jump a car battery, and let it idle for 15 minutes.
  5. After 15 minutes, turn the car off and check the battery voltage. If it’s over 11.5V, charge that battery alone with a lithium charger. If the voltage is still below 11.5V, contact tech support.
  6. Before wiring batteries back together, let them sit alone for 30 minutes and check their voltage. If they have a voltage over 13.4V, they are complete. If not, charge them again and repeat this step.
  7. Once you fully charge each battery individually, you can wire them back together into the system. Remember that battery voltage corresponds with state of charge (SoC) as follows:

State of charge compared to voltage chart

LVD is a critical protection for your Battle Born Batteries, and understanding it can save you a lot of time and money. If your batteries go into LVD often, it may be a sign that you should expand your battery system.

Want To Learn More About Low-Voltage Disconnect and Lithium Batteries?

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 at (855) 292-2831 to answer your questions!

Also, join us on FacebookInstagram, 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 and stay out there.

 

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25 thoughts on “All About Low-Voltage Disconnect

    1. Hi Jim, great question! We advise that you only wake the other battery out of LVD with the other battery only if it is over 12 volts. If it doesn’t wake up then, you will need a more powerful jump, like with a car battery with the engine started. If you have any additional tech questions, please don’t hesitate to reach out and give our team a ring at 855-292-2831.

  1. At what voltage does the LVD disconnect ? Is it suitable to use on the discharge side of two AGM house batteries, say, between the house batteries and the control box to ensure the house batteries don’t get below 50% ie 12.06 volts

    1. Hi Brian, thanks for reaching out! The Battery BMS LVD will shut off the discharge at 10.0v. Our team also recommends that you do not put our batteries in parallel with any other battery type. If you have any additional questions, please feel free to give our sales and tech team a call at 855-292-2831.

    2. I have a fully charged battery, but during high-power usage, it triggers a low-voltage disconnect. But the battery is still fully charged, how to fix this problem? Buy more batteries and connect them in parallel?

      1. Hi Stanly. You are likely not experiencing low voltage disconnect, but the BMS shutting the battery down to protect it. Depending on exactly how you are utilizing your battery, will determine the solution to this issue. Please contact our technical sales team for specific troubleshooting at (855) 292-2831 (M-F 8:00am-4:30pm (PDT)).

  2. Will a solar charger wake up the batery from lvd. (I have 4 in series with midnite solar charge controler)

    1. Hi Austin, our team suggests using another 12V source for about 5 to 10 minutes to get the battery out of low voltage disconnect. This process is similar to jumping a dead car battery and will “awaken” the battery. After the battery receives a charge in this way, it should register above 10V and will be able to accept a charge from a normal charger. If you need any assistance with the troubleshooting process, our team can walk you through the steps at 855-292-2831.

      1. I can answer this one, as I just experienced this. My solar charger (GoPower) does not operate with out at least some voltage detected from the battery, so in my case, no solar was of no help until I jumped it with a portable car jumper box. My entire coach had no power for about a week (even though plugged in to 30amp service) due to me trying to figure out this little hick-up. Just got it back up and running thank fully it was an easy fix, just took a while to figure it out.

  3. Hey guys, I have 3 100amp/hr batteries in my trailer and I need to jump start them. The most positive battery is loaded up with various cordage to the DC/inverter/cerbo etc. to jump the battery I would assume I need to unhook all connectors and put the cables directly on the most positive / negative of the battery?

    Would I keep the large 4/0 cable that connects the various batteries connected?

    Do I jump just one battery or do I have to jump each one?

    Thanks!

    1. Hi Andrew! Thanks for your questions and I apologize for the delay in getting back to you. It would be best to either utilize a disconnect switch or remove the cables from the battery bank when jump starting. You would only need to jump the batteries that have gone into this mode. If you need any additional information, please give our technical sales team a call at 855-292-2831 or send an email to [email protected].

  4. So to wake up your 24vdc battery does require 20vdc? I have never and plan not to ever go into a disconnect state but…Thanks

    1. Hi Richard, we note that in order to get a battery out of low voltage disconnect mode, simply take the battery out of the system, connect it to another 12V source for about 5 to 10 minutes. This process is similar to jumping a dead car battery and will “awaken” the battery. After the battery receives a charge in this way, it should register above 10V and will be able to accept a charge from your normal charger. You can refer to this blog on troubleshooting for any additional tips and tricks: https://battlebornbatteries.com/faq-9-troubleshoot-batteries/

      Thank you for reaching out and please let us know if there’s anything else you need!

    1. Hi Amy, great question! When the battery enters LVD, it requires a direct 12v source to wake it back up. This can be from an appropriate charger or another 12v battery. The trouble with a lot of chargers or inverter/chargers is that they require a particular voltage to begin charging. When the Battle Born is in LVD, the voltage on the battery terminals may only be 2 or 3 volts so the charger doesn’t even recognize that the battery exists.

      If your charger continues to say Low Battery and doesn’t charge the batteries when you plug into shore power, you may need to use a different 12v source to wake the batteries back up. Having a low voltage protection device in your system for your 12v (our team suggests a BGA or Battery Protect), and setting the Low Voltage Cutout on your inverter can help you to not run into this situation.

      Please let us know if you have any additional questions and we would be more than happy to assist with the troubleshooting process.

  5. Low Voltage Disconnect is designed to protect the battery, but hitting it is still outside the normal range?

    How many times can I accidentally hit it before losing say a year of battery life? I’ve hit it 3 times this year, and I feel bad for it each time.

    The worst was this morning, when it was charging by solar and I was getting cabin lights flashing and my diesel heater going crazy by the endless battle of power vs drain.

    1. Hi Neil, good question! There is no lasting effect to the battery if it goes into LVD, the LVD protection is implemented to make sure the battery is not too discharged too far and creating damage. Please let us know if you have any additional questions!

  6. I have two battle born 12v 100ah batteries in series. I just received the batteries and hooked them up to my Grape Solar 12/24vdc 40 amp charge controller with 600 watt solar array. Ive set my settings on the charge controller to the recommended settings per battle borns youtube channel x2 based off the 24v system but my voltage never gets above 26.3 is this normal? I had lead acid batteries on the system that would charge to 28vdc. I have plenty of solar coming in… Not sure whats going on

    1. Hi Luis, please give our team a call at 855-292-2831 so we can troubleshoot and figure out what’s going on with that 26.3 voltage. Thank you and I apologize for the delay in getting back to you.

  7. Under higher loads I’m seeing that the voltage seen at the shunt drops. I’m also experiencing issues consistently starting the generator at lower battery charges. Given that the battery is naturally at a lower voltage at lower levels of charge, could that temporary voltage drop be triggering LVD? The lower-charge battery might be running at 11 volts, but when the higher-amp load kicks in the voltage drops below 10 and LVD shuts the battery down?

  8. Hi Luis,
    Is there a charge current limit when the battery wakes up?
    Victron’s Blue Smart Charger recovery “will attempt to recharge a fully discharged battery with low current and resume normal charging once sufficient voltage has developed across the battery terminals.”
    It seems like connecting a battery with a higher SOC could cause an over-current condition.
    Would the BMS limit the charge current when another battery is connected or there is a charger with a higher output current connected when waking up the battery from LVD?

  9. If my battle born battery is reading 0.000Volts does that mean it’s dead, dead?
    I tried jumping it with a small portable lithium jump pack, and that didn’t work, I’d understand if it’s just not enough amps to get the BMS out of sleep mode. Should I try using jumper cables hooked up to a vehicle?

    1. Hi! Our technical sales team would be happy to assist you in troubleshooting. You can reach them at (855) 292-2831 (M-F 8:00am – 4:30pm (PST)).

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