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When charging at very low temperatures even once, lithium plating may occur that permanently damages the battery and may make it dangerous. But the temperature below that this occurs in both more serious sources I found was -20 °C or about, so should be really cold. High quality battery should have temperature sensor to prevent charging when the battery is ...


You can ride for 15 minutes in below-freezing weather without insulating the battery. Parking your bike outside for an hour in that temperature will affect the battery and the bike will be sluggish.


I found this which suggests that you'll have to open it by force - I'd try a razor saw if there's no obvious edge to pry. You may not need to replace the battery - if there's a protection circuit that is refusing to charge just because the voltage is too low then careful manual charging may bring it back to life (or it may make the cells bulge and burst ...

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