I'm hearing a lot of complaints about the iPhone 4S (and for that matter iOS 5) in general related to battery life. It seems that some people are finding that they're not getting as much out of their battery as they used to.
Want to uncover iOS 5 'secrets'? Check out these posts! Part 1 | Part 2
It's seems that excessive battery consumption is a common complaint for the initial releases of iOS updates, and something that gets fixed by Apple (or at least improved on) with subsequent updates.
Fortunately, there's a lot you can do to help you squeeze more out of each charge. Let's take a look at a few things you can do.
Note: I've tested every single one of these options and each one does seem to have a positive impact on battery life. I'm not suggestion you employ all of them, but turning off what you don't use makes a lot of sense.
Settings > Brightness
Next -->
Set it to go off after a minute or two.
Settings > General > Auto-Lock
Next -->
Wi-Fi
Settings > WiFi
While you're here, disable Ask to Join Networks unless you use this feature often (just turn it on when you need to find a new network).
3G
Settings > General > Network
Bluetooth
Settings > General > Bluetooth
Next -->
Settings
With Airplane Mode active, you can still selectively enable Wi-Fi and Bluetooth if you want.
Next -->
Settings > General > Location Services
Either disable the whole lot, or selectively enable it for a specific set of apps. The more apps that can use Location Services, the more juice they'll use.
iOS 5 has some hidden tweaks too (hidden because you have to scroll to the bottom of the Locations Services screen and click on System Services to find them):
You can keep Location Based iAds and Setting Time Zone off permanently (your time is set by the local carrier automatically anyway).
Next -->
Settings > Notifications
My advice here is two-fold. First, disable notification for any apps that you don't care about by clicking on the individual apps and switching off Notification Center:
Second, control which apps are visible on the Lock Screen by switching off View in Lock Screen ... the more you have showing, the more often your screen will flick into life, draining precious battery power.
Next -->
Settings > General > About > Diagnostics & Usage
Set this to Don't Send.
Next -->
Settings > iCloud
More -->
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