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You can buy a little electrical socket doodad at an auto store for about $6. One end plugs into your cigarette lighter and the other end has terminals for a 9 volt battery. You just snap in a 9 volt alkaline battery, plug the socket into your cigarette lighter and then remove your battery. The 9 volt battery provides enough power to the car's electrical system so you don't have to reset your clock or reset the code on your radio.
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