The stock charger runs 15V 1.2A and 5V 2A. As far as I can tell, it charges at 15V when plugged into the base, charging the base, which charges the tablet in turn. Plug in just the tablet and it switches to 5V. Just bought a PNY 2.1A charger and was disappointed to find it wasn't charging the base. Well, duh, it's only 5V. It charges the tablet, bypassing the base, but somehow seems to drain the base as well?? Odd. Not sure if worth keeping just to charge the tablet. Has anyone come across a car charger that mimics the stock dual voltage charger? That is, I'm looking for a charger that take the 12-18V from the car and puts out 15V or 5V, depending on what's plugged into it. May not even exist. "There's no such thing as a fool-proof system. Someone will make a better fool, tomorrow."