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MY dad ran 8 volt batteries in all his old cars and trucks for many many years. A 6 volt charging system, or battery charger, will charge up an 8 volt battery just fine without any changes. Your cars electrical system will handle it as well. Many people will question your decision and say you should stay with 6 volt but mechanically you will be fine and it WILL spin your starter over faster. I chose to stay with 6 volt myself but although it gets into the teens at night around here it is in the 30s or 40s by the time I drive around.