I have cold cranking power loss anytime they get much below freezing and the fact that charging them when the battery its self is at temperatures of 5'F and below can permanent damage to them in the form of lost capacity.
If you are talking about using a LiFePO4 battery of at least 80 amp hours to start a 3 cylinder engine then it might not ever be a problem. I don't believe I have read anything saying cold discharging permanently hurts them.
When it gets much below freezing my 67 amp hour LiFePO4 battery has difficulty starting my diesel, but that's 395 cubic inch, 22:1 compression V8 with a gear reduction starter.
But the way power output from these batteries drops off when cold I wouldn't be surprised if it could get cold enough in WI to where an 80 amp hour battery couldn't start a metro.
Do these electric vehicles have temperature regulated batteries?
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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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