After a full charge take the b
After a full charge take the battery in for a load test. A partially shorted battery can deliver voltage but quits when there is a demand for amperage.
The reason I say this is because you mentioned brutally cold tempuratures. Batteries can freeze when allowed to become cold soaked which then expands the case and shifts plates within the battery. This can allow spacers to drop out of the plates and allow shorting.
Thats what happened to me on a battery that was 2 years old.
DJ
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