Like the EVO, I first got only about 8 hrs standby time with location services ON and push ON. So:
1) Disable location services for all apps, or at least until the GPS arrow disappears from the top bar. Just like on all phones, GPS is a huge battery suck, and it won't work indoors anyway. Particularly, with Navigation - The Google Nav app that comes free with the Evo is considerably more awesome than anything available for the iPhone, but I could barely drive to the grocery store without using a car charger.
2) Disable Push if you can. Disabling Push globally still allowed my Exchange account to push (Push for Inbox is the default); I had to change that to "fetch" separately in the Push "Advanced" settings.
3) Disable Wifi if you can. Wifi isn't as big a battery suck as on the HTC Evo, though.
3) In spite of what the fanboys say, it's still possible for a badly behaved app to suck battery in the background. Try not to download dodgy apps, and worst case it's probably faster to just reboot your phone than kill off the apps one by one in the recently used view.
Once I found out it was Google Latitude background location updating that was sucking my battery dry in a day, I disabled that and now can get 2, maybe more, days battery life with location services ON, Wifi ON, and Bluetooth ON. I could *not* do that on the HTV Evo.
Would be nice to disable GPS entirely and rely on passive Wifi/Cell triangulation, but application whack-a-mole type tools, like on the Droid, don't seem to be necessary. Steve just wants you to quit fiddling, shut up, and enjoy your wonderful phone. So, compared to the Evo, I *do* like the iPhone 4 more.
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