The other TRICK to batteries and weather/ temps is that a very minor CORROSION that you can only see when you remove the terminal can reduce battery charge from VERY GOOD to Very Marginal, over night, and
as charge goes down, cells freeze at higher temps (+20s+30s vs zero to neg30) and and damage/warp cells/ plates... WHERE CLEAN TERMINALS, AND FULLY CHARGED would have kept battery healthy.
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