If you've upgraded to iOS 7, you might be experiencing
reduced battery life. According to multiple posts across the Web, including
Apple's own tech support forum, battery life is impacted to different extents
for different people. For those who are struggling to make it through a day on
a single charge, here are a few tips:
Turn off all non-essentials
Bluetooth and Wi-Fi are the most obvious candidates when it
comes to battery depletion. If you aren't turning them off altogether when not
needed, make sure your iPhone or iPad isn't unnecessarily connecting to Wi-Fi
networks and Bluetooth accessories by deleting them from the lists of
previously paired devices.
Turning off cellular data would mean that you won't receive
email notifications, Whatsapp messages or any other app alerts, but it will
also vastly improve your battery life expectancy. To do this, go to Settings
> Cellular and move the Cellular Data slider to the left, switching it off.
For a less drastic approach, you can decide which individual
apps are allowed to send and receive data when your phone is idle. Go to
Settings > General > Background App Refresh to selectively choose which
apps are allowed to refresh themselves using your Internet connections.
Apple's mobile OS also uses background data transfers for
things like syncing iTunes purchases, iCloud backups, and Photo Stream. Turn
these off if you don't need them - of course iCloud is pretty handy, so don't
kill this unless you really need to.
App notifications also require Internet access, so turning
some of these off will help you manage power consumption. Go to Settings >
Notification Center and disable spam magnets such as games and commercial apps.
