said by obeythelaw:Hmm...I'm curious if it makes a difference because I charge, 95% of the time via USB cable with my computer. In the car, I honestly, can't say I notice when I use GPS. I use an AT&T phone charger while in my car.
South1178 is absolutely right. Charging via usb cable through your computer is a very weak level of charge, easy to be "out-drawn" by almost any concurrent usage of the device.