When I got my Incredible I bought this charger after reading its reviews from Amazon, but have never really used it much as I haven't gone on any long outings with my phone yet. Amazon.com: Motorola P513 Vehicle Power Adapter MicroUSB Rapid… It charges the phone much slower than the wall charger, but it does charge and it works. Lately I've been working on putting together a car mount for my phone (Soundgate M2 plus TETRAX, excellent combo) and decided today to see if my phone would get enough juice from the car charger while it was running navigation, as I'd heard about people having that problem. Again, my battery charged slowly, but got very hot, nearly 140F (60C) which is very close to beyond what the back of the battery suggests not going over, which is 60C. My phone is on the OEM USB wall charger right now running navigation as a test and happily charging at 37C. Anyway, after reading all the topics on batteries overheating before this too, I'm wondering if charging via USB cable heats the battery less than a one-piece dedicated charger? After I get my phone mounted I can position it infront of a vent to cool it off (especially since its summer and the car will naturally heat the battery) but if I can prevent heating farther I think that would be a good idea. For those charing in the car with a mini-usb cable plugged into a charger, how is your battery heat doing?