Assuming you have a full tank of gas and the electricity is off so you can not charge it in the house, you do not want to run down the car battery so I would start the car after a half hour to keep the car battery fully charged and to enjoy the car A/C if only for a short time. The usb or cigarette lighter chargers are fairly slow charging. Make your calls while it is charging and also charge up your ipad if you have one at the same time.
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