How long does your iphone battery last?

[NIKKG]

What is your iphone battery life? Today I tested my iphone 4 by running a heavy usage test since morning. I let it run only on 3G. In the morning I streamed Pandora at work and some internet , after work I listened to the music player through Bluetooth on my Motorola S9HD headphones and I also purposely let the GPS run by using Trapster in the background as I went bike riding.

All together, I got close to 12 hours total of heavy usage. That’s very good and probably the best I ever had on a smartphone. The big battery killer seemed to be the GPS, as soon as I put it on, my battery starting draining quickly. I think without out GPS I probably could’ve easily had another 2 hours.