The cold issue is what's stopped me from trying a LiFePO4 battery. We have weeks-long stretches every winter where it doesn't get above freezing, and I'm a couple hundred miles south of Wisconsin.
If it were me--and I'll probably do this when the battery goes--I would just get a Toyota replacement. Mine's lasted 6 1/2 years and still going strong.
I'm not sure about the Gen 2, but the Gen 3 turns off the SKS after a certain period of time of inactivity, a couple days or something like that.
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