Re: charging A 6V Battery

Posted by KEB on October 01, 2007 at 21:06:54 from (72.19.170.5):

In Reply to: charging A 6V Battery posted by Glenn FitzGerald on October 01, 2007 at 10:49:23:

Lead-acid batteries need to charge to a constant voltage, not a constant current. A 12 volt charger will work for a partial charge as long as its current is low enough to avoid overheating the battery, but if you let it go too long even at a low current it'll exceed the rated battery voltage and boil the cells dry. Might be OK for a quick boost just to get something started, but don't depend on it to properly charge a 6 volt battery.

Putting a light bulb or other resistance in series with the battery will help limit the current and avoid overheating the 12 volt charger, but won't do anything to keep the charger from supplying an overvoltage when the battery gets close to full charge.

Buy a 6 volt charger. They're not that expensive. My grandfather had a charger he built by mounting an old 6 volt generator and an electric motor on a board and belting them together. Crude, but it worked.

Keith

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