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13.8 volts is the nominal output from most alternators, so it'll be just fine to run most anything for the car.
Most chargers are too smart to let you use them as a power supply.
I usually use a 12volt battery. I have a few that are handy, like from the lawn tractor or my trailer winch.
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-John
'94 968 Iris Blue
'85.5 944 White - Rally Cross and wrenching practice
'84 944 Gemini Grey (gone, but missed...)
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