rezenclowd3
macrumors 65816
The iphone 5's battery may be more efficient, BUT it's still a moot point because all things being equal, the larger screen is more advantageous, especially if you are wifi browsing on a cell phone screen for 10 hours!
The battery is not more efficient. Maybe the Apple hardware or OS is.
Either way, you have a battery that is 2x as large in the G2 with a screen that is not 2x the size (physically or resolution) with both companies using the latest hardware where efficiency and low power usage are forefront for R&D, makes sense that the battery life is better on the G2.
EDIT: Bluetooth still sucks on the G2, even with some changes made through ADB, along with problems with displaying info to my car stereo. Pandora now goes into auto mode finally, but it is still finicky. For this reason alone I may use an iPhone next time should battery life be this good. To be fair, I am not discussing bluetooth sound quality, just features that should work, as BT sound quality will be subpar to CD/record quality.