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I've ordered a LiFePO4 battery for my Insight to put in parallel with supercaps and want to get some thoughts on protecting the battery from cold damage.
My initial idea was a large resistor to the battery so most of the starting current and subsequent charging would be to/from the caps, but the battery could still keep the caps charged and allow me to have lights or radio on for more than a minute before losing the ability to start the car. However, I had the idea of a large resistor just to dramatically slow charging in subzero weather, and maybe use a pair of diodes so it can discharge at full speed. Or, maybe a resistor in both directions but a higher impedance one in the charging direction.
Does charging at all at low temperature damage the battery, or is it rate dependent?
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