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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...
wa8yxm's avatar
wa8yxm
Explorer III
Nov 25, 2020
Also measure voltage at two points
The battert (Terminal to terminal) and somewhere "Down stream" like the back side of a light switch... you may see a dim light (won't be a great light at the 2nd spot)

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