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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...
theoldwizard1's avatar
theoldwizard1
Explorer II
Nov 26, 2020
A load tester is a good tool. A better that you can use all of the time is a battery monitor, like a Victron Victron BMV-700.

Second, depending on how many cycles those batteries have been through, it just may be their "time".

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