You will need a charger with 24 volt capability.
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The battery will attempt to charge the charger since the battery is at a higher voltage than the charger. Thus, the battery will simply discharge and generate heat. If you leave it plugged in long enough, eventually the battery will discharge to a point where it can maintain only 6V, where it will stay until you actually charge the battery.
AnswerAccording to WikiPedia (http:/en.wikipedia.org/wiki/Rechargeable_battery), the nominal cell voltage of a Lead Acid wet-cell battery is 2.1 volts, this implies there are 6 cells in a 12 volt Lead Acid wet-cell battery.
1.5v
An Eveready 748 is a combination battery--it has both a 90-volt B battery section and a 1.5-volt A battery section.
Active pickups have 9 or 18 volt battery passive has no battery