Robert Bruninga via EV wrote:
I know that Lithium batteries perform worse at lower temps. But what does that mean? Charging, or using? which is worse. Does cold prevent the battery from accepting a given capacity, or does cold prevent one from using a given capacity that is already in the battery?
Batteries are "cold blooded". Cold temperatures slow the chemical reaction rates and increase the internal resistance, making both charging and discharging more difficult. The capacity is still there; you just can't use it without the cell voltage going out of spec.
But the exact amount of performance loss varies. There are many variations of lithium cells, and each is affected differently by temperature.
If capacity and performance in cold weather are important, that means providing some way to insulate and heat the battery to keep it up to operating temperature.
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