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A normal truck sized lead acid battery soaks up about 2 amps to float it from full charge 12.8v resting voltage to 14v.
It's actually 20°F. You don't want to charge LiFePO4 batteries when their below 20°F. Freeze they should be fine.
My LiFePO4 batteries have lasted so long because they are not in the engine compartment.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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