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it is best to use electricity as it is generated, as you don't get as much out of the battery as you put in the battery, first law of thermodynamics.
so if you must charge your cell phone do it while the car is running, or get a plug splitter and a window mounted solar panel that keeps your battery toped off.
also your charger often uses power while plugged in a wall outlet even if the phone is not pluged in to it, mine is about 1 watt 24 hours per day.
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