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How to charge LFP battery: the manual of a particular car is decided

Part of the Guide Electro-mobile batteriesAre you choosing a car? The battery chemistry of specific models can be found in catalogue of electric cars.

For some LFP variants the manufacturer requires regular full charge for calibration of the indicator. The interval and the daily limit do not derive only from the abbreviation LFP: find the manual of the exact model year and the recommendation on the car screen. Official instructionsEven LFP is no reason to keep a car full of heat for a long time.

Why does LFP sometimes want 100 %

LFP has a very flat voltage curve: between 20 and 90 %, the battery-cell voltage changes very little. The battery management system (BMS) therefore has difficulty estimating the actual state of charge, and the estimate gradually "runs away." Charging to 100 % is a calibration point for BMS. When the car does not see it for a long time, the indicator percent may lie calmly about 10 % - uncomfortable detection in the middle of the highway.

Rules for LFP

1. Set the daily limit according to the vehicle manual. 2. Follow the full charge interval if required by the manufacturer for calibration. 3. Don't leave the car. stand for weeks at 100 % in the heat; for long standing check recommended state of charge in manual. 4. Even LFP - don't leave the car dead in the long run.

LFP in winter

Weakness LFP is frost: without preheating, the power and speed of DC charging decrease more significantly than with NMC. Always turn on the battery preheat (navigation on the charger starts it automatically with most cars) and count on the first minutes on the stand to run slowly. cold and battery.