Originally Posted by bachler
As stated in a prior post ,After 9 years I changed my batteries. 3 x 30 HH; I buy my batteries direct from the manufacture, DYNO battery In Seattle. I have been through the plant many times. From what they tell me. Each cell has 2.4 volts in it. So each 6 volt battery (golf cart inc.) Has 7.2 volts when fully charged, A 12 volt battery ,has 14.4 when fully charged. and at that voltage it is not overcharged;;; Now for the benefit for some, the gages may,be calerbrated to show 12 volts.. That is NOT correct. The 12 volt battery charged WILL read 14.4 When properly/fully charged; Life is good..
Your data is mostly correct, but your understanding of it is certainly not correct.
14.4 volts is, indeed, required to fully charge a 12v battery. The battery electrolyte needs to be "overcharged" to the point of gassing to be fully charged. The battery composition, construction and specific gravity of the electrolyte is DESIGNED such that it will maintain a fully charged voltage of approximately 12.6 after the surface charge is removed.
The surface charge (or "overcharge") will dissipate slowly, by it self, or quickly with a small load, once the charge voltage is removed.
Your gauges and meters ARE NOT calibrated to read 12v on a 14.4v battery.
ANY decent charger will reduce the voltage to <13.6 once a full charge is reached. Continuous 14.4 volts will boil away enough water to begin to ruin a battery in a few weeks.
My first real job was building 6V batteries in a Gould National Battery plant, so I, too, have "toured the factory".