13.0V Resting
When fully charged, the group 27 batteries that came in our 2014 Sunseeker will be 13.0 Volts. This IS the resting voltage, even after a few days. The specific gravity is high too, like 1.30 iirc. Wh...
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I see a resting voltage hour after hour of around 13.1 volts on my Group 31 90AH Optima yellow top battery after fully charging it. For what it's worth, this is an Optima AGM battery that is no longer available.
All my other AGM batteries have shown only the usual 12.7 - 12.8 resting volts after being fully charged. I have no idea how, or why, my Optima's AGM battery chemistry differs ... but it sure makes me feel good. It gives me a warm fuzzy feeling to have a "12 volt" battery that starts out delivering ~ 13 volts!
All my other AGM batteries have shown only the usual 12.7 - 12.8 resting volts after being fully charged. I have no idea how, or why, my Optima's AGM battery chemistry differs ... but it sure makes me feel good. It gives me a warm fuzzy feeling to have a "12 volt" battery that starts out delivering ~ 13 volts!
