so i got myself one of the 12v adapters for my cell phone (by Belkin), and on the package it says;
"... has precision circuitry that keeps the supply voltage to the phone constant since your vehicle's supply voltage will change every twenty minutes ..."
really,,,, must be some universal constant within the automobile industry. it goes on to say "... your vehicle should be running while phone is connected to avoid draining vehicle battery...". i suspect a small honda battery could power a cell phone for weeks, if not months...
what crap these companies put on their products... it was worth a chuckle just to read it....