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.
Drop the screen brightness
One of the easiest ways to improve battery life on the iPhone is to drop the screen brightness. When I updated my iPhone 4 from iOS 4 to iOS 5, Apple jacked the brightness up to an unnecessary 'supernova' level. Unless I'm outdoors, I usually keep my screen pretty dim.
Another revamped feature in iOS 5 is notifications. The new notification Center in iOS 5 gives you a greater overview of what's happening, but that comes at the cost of greater battery consumption.
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.
The more apps you have running in the background, the more juice you'll use. Kill off any apps you don't want running in the background regularly by double-tapping the Home button to bring up the multitasking dock and then press down on an icon until they all start to jiggle, then kill any apps that might be working in the background - apps such as Skype and Pandora are likely suspects.
The last resort
Turn the handset off to conserve power - Press and hold the top button until the Slide to power off instruction appears, then slide to power off. Simple really!
Be your own recharge station
Carry a battery pack with you. I like and extensively use a few New Trent battery packs (the 5000mAh IMP50D and the monster iPad-compatible 11000mAh IMP1000).
Never pass up an opportunity to charge up! That means carrying a charger with you (or at the very least an iPhone USB cable) and having a car cord handy when on the road.