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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 Replace a 12-Volt Power Outlet A 12-volt power outlet has been commonly used to power a cigarette lighter, usually mounted in the dash panel of your vehicle. Now, traditional 12-volt power outlets have given way to outlets designed to charge your mobile phones or power your MP3 players. They are the same 12-volt power outlets used in older cars, only the manufacturer opts not to give you the cigarette lighter with them now. Replacing the 12-volt power outlet is the same on new cars as it is on older cars. Things You'll Need Socket set Screwdrivers Pliers or adjustable wrench Instructions Remove the dash panel to which your 12-volt outlet secures. In general, you need a Phillip's screwdriver and/or a socket set to remove the plastic panels on the dashboard. Every make and model uses a slightly different process for installing the dash panels. If necessary, refer to the vehicle repair manual for your vehicle make and model if the bolt locations for the dash p...