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A fully charged "12 volt" lead-acid battery is about 12.6 volts.While charging you need to drive it at about 13.5 to 14 volts to make the current flow in. Primary tests# battery voltage test# charging test# cranking/amp testCheck the cell electolyte density with a hydrometer. The density will change as the battery takes a charge.See also: [[Lead Acid, AGM, and Gel-Cell Batteries]]