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A 3 Ah LFP cell is charged to 100% at 25°C temperature. What happenes if I cool down the charged cell to -20 °C temperature? At -20 °C the cell can store only 2 Ah. Does it mean, the cell is overcharged by 1 Ah, equivalent to 30 %? Is there a risk that the cell will explode?

I assume, that this cell would be protected by the BMS in a battery configuration, if the overcharge causes an overvoltage. In this case, the BMS should dissipate the 1 Ah overcharge in order to not exceed the max cell voltage.

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That's not how it works.

What happens is that under low temperatures you cannot extract more than 2 Ah out of a fully charged cell because internal resistance rises under low temperature. The voltage of the charged cell will not change.

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