That's only a difference of 0.25
volts on each cell from
fully charged to
fully discharged. So a
12volt battery will measure at about 12.9
volts when it's
fully charged and about 11.4
volts when it is
fully discharged. That's a total of 1.5
volts that represents the
full range of
charge on a
12volt battery.
Jan 12, 2016');})();(function(){window.jsl.dh('20','
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A healthy 12 volt motorcycle battery should maintain a range from 9.5 - 10.5 volts under the load, for a good 30 seconds straight. If the battery begins to hold and then steadily declines, there is a problem. If the voltage drops to 0 volts, there is a problem. We call this, the open cell.Jun 5, 2012
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Voltage on a fully charged battery will read 2.12 to 2.15 volts per cell, or 12.7 volts for a 12 volt battery. At 50% the reading will be 2.03 VPC (Volts Per Cell), and at 0% will be 1.75 VPC or less. Specific gravity will be about 1.265 for a fully charged cell, and 1.13 or less for a totally discharged cell.
