Originally Posted by
d.vader123
... I heard that if you turn off wifi, turn off automatic updates to social media sites, dim the brightness, and switch the screen off during the ride, you can increase battery life significantly...
Yep. Been there, done that. They all help to a degree. Switching off the screen is the most helpful, but then of course you can't use it for navigation or see any of your ride data. The best I got was a bit over 3 hrs, but that was with an iPhone 3G. I haven't tried with my current iPhone 4 as I use a Garmin 705 now.