On Nov 28 2009, 12:52 pm, âÍÁ Á³Õ »Ñ·àÁ ËØÁ <=
macmi...@gmail.com>
wrote:
> > Very conveniently, the relationship between a battery's state
> > of charge and its voltage is linear (10% per 0.10V) between about 90%
> > (12.70V) and 20% (12.0V). However, when a battery has been on
> > charge, even if its not fully charged, the voltage will be up
> > around 13.8V. This will slowly drop to around 13.6V over the next
> > few hours, but even if left overnight it shouldn't drop below
> > 13.0V unless the battery was only partly charged or is on the way out.
> Battery manufacturers would disagree slightly.
> If you charge up a sealed AGM battery, you may read
> 14 ~ 15 volts when you first take it off the charger, but the resting
> voltage will drop down to 12.8 volts and stay there in about half an
> hour, assuming that the battery was in good condition and took a full
> charge.
Manufactueres would not disagree.
It's called 'surface charge' and 'pros' will lightly load a battery
for a minute or so to
drain it before they take voltage to estimate the 'state of charge' to
which you refer.
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> > of charge and its voltage is linear (10% per 0.10V) between about 90%
> > (12.70V) and 20% (12.0V). However, when a battery has been on
> > charge, even if its not fully charged, the voltage will be up
> > around 13.8V. This will slowly drop to around 13.6V over the next
> > few hours, but even if left overnight it shouldn't drop below
> > 13.0V unless the battery was only partly charged or is on the way out.
> Battery manufacturers would disagree slightly.
> If you charge up a sealed AGM battery, you may read
> 14 ~ 15 volts when you first take it off the charger, but the resting
> voltage will drop down to 12.8 volts and stay there in about half an
> hour, assuming that the battery was in good condition and took a full
> charge.