so on a trip to another town I used gps for about an hour while on a car charger. When I arrived and unhooked my battery was completly dead. And I started with a full battery. Bad apple
And that's one of the main reasons I'm sticking with my first gen iPhone...what's the point of having a mobile device when it needs to be plugged in 3 or 4 x's a day?! 3g and a blue icon that moves on a map is a step down for me! Don't beleive the hype people! Cheers