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        Q: How can i test and charge a 12 volt battery?
A: The voltage manufactured by the charger is required to MORE than the voltage of the battery . A six volt charger WO N'T charge a twelve volt battery . A twelve volt battery in a six volt system 's enough to FRY some of the circuits . Your very bestest betting is be purchased the PROPER battery . It DEFINITELY costs lower than conversion the engine .   Sam B : A transformer solely was working with AC current . Vehicles use DC . A voltage regulator is theoretically feasible , but the appropriate battery continues to be less expensive . 

Q: Can I use a 12 volt car battery charger to charge an 18 volt nickel-cadmium battery?
A: A 12 volt charger will charge twelve volt batteries solely unless it has a features that allowing you to alter the chargers voltage . But on fast or slow charging twelve volts is twelve volts so most twelve volt chargers are solely good for 12 volt batteries . 

Q: Why does a truck or tractor uses 24 volt battery, while a car uses only 12 volt battery?
A: It ought to be fine , unless the wrapper has warnings against that .