Is it ok to charge at low temperature? (0c or lower)

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bigbug

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As winter is coming, there are more chances that I need to charge in public station below 0 degree (C). But I remember reading somewhere that battery degrades faster when charge at low temperature. Can anyone comment on this?
 
The Canadians have dedicated battery warmers. Here in the US we have a thermistor system. With a thermistor, internal resistance is higher at lower temperatures. Thus, initial charge energy does not go into the battery but is lost as heat-heat that warms the battery. As the thermistor heats up resistance decreases and charge starts to go into the battery. I don’t believe that the thermistor system is as robust as the dedicated battery warmer or else the Canadians wouldn’t have a different system. That said the operators manual says that at -22F the car will not start. One could assume that above that temp it is okay to charge.


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