![]() ![]() ![]() A discharged 12 volt battery is 11.6 volts at rest.After a full charge, if the battery is not going to be float charged, the at-rest voltage will slowly return to the nominal full-charge voltage. You may see it go as high as 16 volts when charging, depending upon the charger. A float charge (maintenance charge) for a 12 volt system is 13.5 to 13.8 volts active charging requires at least 14.1 volts. When a 12 volt charger is operating on it, the voltage will be higher.A fully charged, new 6 volt battery will be at 6.3 volts at rest.A fully charged, new 12 volt battery is 12.6 volts at rest (each of six cells is 2.1 volts). ![]() Batteries that are shallowly drained (cycled) will last a long time, while batteries that are deeply cycled will have shorter lives.In larger series-parallel setups it's a good idea to swap batteries around every year or so.Newer batteries added to existing sets of batteries will be as worn as the originals very quickly. ![]()
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