The Battle Born Educational Series | Wiring & Installation Fundamentals
Integrated battery heating is designed to protect your system in cold temperatures and ensure your batteries can safely accept a charge.
In lithium systems, temperature plays a critical role in charging behavior. While Battle Born batteries can discharge in very cold conditions, charging is only allowed once temperatures rise above safe limits. The built-in Battery Management System (BMS) manages this automatically to protect the battery from damage.
Understanding Cold Weather Operation
As a baseline:
- Batteries can discharge down to approximately -4°F
- Charging is allowed once temperatures rise above about 25°F
If temperatures are too low, the BMS will prevent charging to protect the internal cells.
Integrated heating helps solve this by warming the battery to a safe temperature before allowing charge to begin.
How Integrated Heating Works
Inside the battery is an automatic heating system.
This system activates when the internal temperature drops below approximately 35°F and turns off around 45°F. Once activated, it warms the internal cells until they reach a safe operating range.
However, there is one key requirement:
The heating system will not activate unless the heat-enable circuit is connected.
Enabling the Heating System
To enable heating, a simple connection must be made.
You connect the heat-enable post to the positive terminal using a jumper wire. Once this connection is in place, the battery will automatically manage heating whenever conditions require it.
For a single battery:
- Run a jumper wire from the positive terminal
- Connect it to the heat-enable post
- Ensure the connection is secure
Once installed, heating becomes automatic.
Adding a Switch for Control
While a direct jumper works, many systems benefit from adding an inline switch.
Instead of connecting the jumper directly, route the wire through a rocker or toggle switch. This allows you to manually turn the heating system on or off.
This can be useful for:
- Controlling when heating is active
- Preventing unnecessary power draw
- Managing the system during storage
The switch should be mounted in a convenient location, with all wiring properly secured.
Preventing Unnecessary Battery Drain
One important consideration is that the heating system draws power from the battery itself.
If the heat-enable circuit is left connected, the heater can activate automatically in cold conditions and consume energy even when the system is not in use.
Adding a switch allows you to disable the heating circuit when needed, helping prevent unnecessary battery drain during storage or downtime.
Wiring Multiple Batteries
In systems with multiple batteries, heat-enable wiring should be coordinated across the entire bank.
This is typically done by daisy chaining the heat-enable posts together so all batteries are controlled from a single connection or switch.
There is one critical rule when doing this:
Always enable heating from the highest voltage point in the system.
For example:
- In a 12V system, connect from the 12V positive
- In a 24V system, connect from the 24V positive
- In a 48V system, connect from the 48V positive
This ensures proper operation across the full battery bank.
Heating Performance and Timing
Because the heating system uses internal battery power, it may take time to bring the battery up to a safe charging temperature.
If a battery has been sitting in freezing conditions, it may take approximately 2 to 4 hours for the heater to warm the cells before charging can begin.
This is normal and part of the system’s protective design.
The Bottom Line
Integrated battery heating is an automatic system designed to protect lithium batteries in cold environments, but it only works if it is properly enabled.
By wiring the heat-enable circuit correctly and optionally adding a switch for control, you ensure your system can operate safely while managing power usage effectively.
When set up correctly, the system handles heating automatically, allowing your batteries to charge safely even in challenging conditions.
Ready to put it all together? Explore the full Battle Born Academy series for everything you need to design, install, and operate a lithium power system with confidence. Visit the Battle Born Academy.
