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The Dirty Little Secret Dealers & Battery Stores Don't Want You To Know. In the good old days battery chargers were simple AC tranformers that converted the 120 VAC to a rectified 12 volts DC and simply shut off once the battery was charged to a predetermined voltage between 12.8 volts to 14 volts. But with the advanced electronics used in todays battery chargers, they now have a built in set point voltage that they will only turn on and start charging in the charger senses a minimum of 10 Volts DC present on the battery. So what happens when...