For temperatures between 0 F and 32 F, to what extent, if at all, should I insulate electric bicycle batteries? I have read that they do not like temperature extremes. Should I wrap a battery in 1 layer of bubble wrap during weather like this? Multiple layers? What about other types of insulation? What amount of insulation will cause the battery to heat itself to optimum temperatures without overheating? I realize that this depends on the temperature range, speed, and reliance on the battery when riding, so some sort of algorithm that takes all of these factors into account would be ideal, or at least some safe minimum amount, assuming the temperature is below freezing.
For clarification: I am talking about when the bike is being used outside during the winter. I intend to store it inside all the time when it is not in use.