Currently Being ModeratedDec 2, 2012 12:38 AM (in response to stephen1981)
Did you restore your iPhone 5 from a backup? This can bring over the wrong battery profiles.
If so, go to Settings>General>Reset>Erase All Content and Settings. (THIS WILL WIPE THE PHONE).
Then set the phone up as a new phone and import all your content from both iCloud and iTunes without restoring from a backup. Then cycle your battery (Drain to 0% so it dies, then charge to 100% without interruption). Repeat the cycling for a few days.
Didn't restore from a backup? Spend a few days cycling your battery.
Turn off unneeded location services and notifications. Turn off wifi and blutooth when not using them. Turn off LTE if you don't really need it. Turn down your screen brightness and enable auto brightness.
If all else fails, book a Genius Bar appointment, the technicians will be happy to look at it for you!
Currently Being ModeratedDec 2, 2012 1:55 AM (in response to stephen1981)
Give it a week of cycling; Draining to 0% and letting the iPhone die completely, then charging to 100% without interruption.
If nothing improves by the end of the week, I'd book in to see the Genius Bar.
I just upgraded to an iPhone 5 and was disheartened by the battery life but now after a few days of cycling it's improving immensely. The battery needs to "learn" its capabilities before it can work accurately.