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profdant139's avatar
profdant139
Explorer II
Nov 25, 2020

Battery failure puzzle: voltage good, little power

I have (or had!) two five year old group 31 NAPA deep cycle marine batteries, rated at 110 amp/hours each. They were not hooked up in parallel or series -- I use one at a time, swapping them out as n...
2oldman's avatar
2oldman
Explorer II
Nov 25, 2020
2 things immediately come to mind: age, and temperature. I rarely got more than 4 years out of 6v Trojans, and they would act like yours when failing.

Cold batteries, if that's the case, don't do well either. Voltage indicates the *potential* to perform, but not the endurance.

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