I have finally found a car charger that works. I think. I got a Schosche Revive II and used it today on a two hour trip. The charger is made for iPad and is rated to push 2.1 amps. I started the trip with a 52% charge. I used GPS and Last.fm the whole way. I ended the trip at 56% battery. I guess I can understand the small increase in charge but I don't understand why it dropped so quickly after taking it off the car charger. Within an hour it dropped to 21% with zero use in a high signal strength area. This has been my experience with every car charging solution I have tried. What is different about car charging that causes this? 2.1 amps should be capable of charging this device even while under heavy use. Am I wrong?