So, I've been hesitant to use a car charger with my iPhone 4 because I've read stuff about car chargers destroying batteries or not working and stuff, but my friend has this CH102 USB car charger, and insists that 5V to USB is 5V to USB, and that it would work with the phone just fine. I tested it with my iPhone 1, and it seemed to work. Do you think it's okay to use with the iPhone 4? It would be really handy since I'm currently on the road about 10 hours a day. Thanks.