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12.75 is a little low for a battery at rest, should be a little over 13V. Try turnning the engine over and see what the reading drops to. Be careful keeping a battery on charge, you have to use a tender that shuts off at full charge or it will over charge and ruin the battery. The 12.75 could be OK if you have run it down.



Depends how long a lead acid battery has been off charge whether 12.75v resting is too low. Right off charge, yeah. Three hours or more off charge, probably not.