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The battery itself is the regulator.You can put a 12 volt battery in the A and it will charge.The generator can put out up to 40?? or so volts.I have a generator on one of my A's that was run on 12 volts for 40+ years in a tractor.It hauled wood,plowed the yard,hauled sap,raked hay,until the engine wore out.I cleaned the generator up and have been using it now for 12-15 years or so on 6 volts again.