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Old 16th May 2006, 11:51 PM   #11
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The battery sits at 12.5v, a 12v supply can not and will not keep it charged, that's why your car's alternator runs at 14.4v and not 12v.
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Old 17th May 2006, 05:22 AM   #12
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Sigfrid,
For your reference;

Quiescent (open-circuit) voltage at full charge: 12.6 V
Unloading-end: 11.8 V
Charge with 13.2-14.4 V
Gassing voltage: 14.4 V
Continuous-preservation charge with max. 13.2 V
After full charge the terminal voltage will drop quickly to 13.2 V and then slowly to 12.6 V.

It is conventionally considered that
12.65 V is full charge
11.89 V is zero charge

You can draw your conclusions
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