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profdant139's avatar
profdant139
Explorer II
Nov 01, 2016

How to test working capacity of battery: not technical

(If you are a highly sophisticated technical battery expert, I advise you to stop reading. This post is designed for people like me, who are not experts.) I have two group 31 12V marine deep cycle...
BFL13's avatar
BFL13
Explorer II
Nov 02, 2016
"I started with a fully charged battery (which reads 12.9 V when it comes off the charger) and then let it rest for a day, so that the initial reading was 12.7 volts."

I don't understand this part. When I finish charging, the batts are still over 13v and it takes a couple days for the surface charge to get below 13v.

I would be worried if I got the quoted numbers.

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