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I have read that LiFEpo4 is safe to discharge down to about 0 F, but should not be charged at any significant rate if below 32 F.
The way I see it, LiFePO4 will work in my alt delete because I garage my car, where it would be safe to charge. Also, on a longer trip where I need to turn the alternator on to charge the battery, heat from the engine would keep temps above freezing.
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