CHARGING
Warm the battery before charging
Heating helps the cells reach a temperature that permits charging.
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PRACTICAL GUIDE · BATTERIES AND COLD
Battery with or without self-heating: is it really necessary?
In Quebec, cold weather is an important factor for lithium batteries.
Self-heating is often presented as essential, but its usefulness mainly depends on where the battery is installed and when it is used.
01
Why cold temperatures are a concern
Cold temperatures do not affect discharging and charging in the same way.
- Available capacity and power decrease as temperature drops.
- Many LFP batteries should not be charged below 0°C unless the manufacturer explicitly allows it.
- The battery management system may block charging to protect the cells.
- Improper cold-weather charging can accelerate ageing or damage the battery.
Always check the data sheet
Charging, discharging and protection thresholds vary by cell chemistry, BMS and model.
02
What does self-heating do?
PROTECTION
Protect the battery
It reduces the risk of damaging the battery when charging after exposure to freezing temperatures.
WINTER
Improve availability
It helps a system continue accepting a charge during winter operation.
Exact operation varies: some models use incoming charging power, while others may use some stored energy.
03
When is it genuinely useful?
| Situation | Self-heating recommended? |
|---|---|
| Unheated cabin in winter | Yes |
| RV or camper van used in winter | Yes |
| Battery installed in an unheated space | Yes, if cold-weather charging is possible |
| Heated home, indoor battery | Often unnecessary |
| Three-season use only | Generally not a priority |
04
The limits of self-heating
- Heating uses energy and can delay the start of charging.
- It does not eliminate all performance loss in severe cold.
- It does not replace a protected, ventilated installation that follows manufacturer instructions.
- It adds cost and sometimes complexity that may not be useful in a consistently heated space.
PRACTICAL GUIDELINE
Useful when cold exposure is genuinely part of the use case.
Self-heating is not always mandatory. It becomes strongly recommended when an LFP battery may remain below freezing and still needs to recharge regularly.
The final choice must always respect the manufacturer’s published temperature range.
CHOOSE FOR THE CLIMATE
Will your battery be exposed to cold temperatures?
Describe where it will be installed, when it will be used and how it will be charged.