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For How Long Can a Car Battery Charge a Cell Phone? Car batteries are available even in the most remote places. With a 12-volt adapter, these batteries can charge your phone. Knowing how long you can use the battery to keep charging your phone requires some basic math skills. How Powerful Is The Battery Car batteries deliver a steady 12 volts, but the current varies according to the design of the battery. Batteries are rated in amp-hours, describing how many amps the battery will deliver over a set period of time. High amp-hour batteries last longer than low amp-hour batteries. How Much Power Does The Charger Use? Phone chargers draw power from the battery and convert it to a voltage suitable for the phone. Putting power into the phone necessitates taking power out of the battery, and the faster the power is taken, the quicker the battery is discharged. Typical Charger Power Usage Research conducted at the Lawrence Berkeley National Laboratory shows a mobile phone charger,...

How to Charge a Car Battery Through a Cigarette Lighter An automotive electrical system normally has one or more power accessory points. These accessory points are often cigarette lighter outlets. However, most vehicles manufactured since the 1990s contain dedicated power accessory outlets. Many automobiles have their cigarette lighter outlets wired so that the outlets only work when the automobiles are running. However, power accessory outlets are usually hardwired to the battery, and are always active. A power accessory outlet may also be used as a means to trickle charge an automobile battery. Some accessories, such as solar battery chargers, are designed to take advantage of the bidirectional nature of a hardwired power accessory outlet. Things You'll Need Automobile with hardwired power accessory outlet Solar battery charger with automotive cigarette lighter plug Instructions Place the solar battery charger, shiny-side up, on the automobile's dashboard....