iPhone 5 battery

paddyrg

Have you installed an app that is doing background updates/synchronisations? Many do (to update headlines/news/adverts), and some make things worse by switching on the GPS as well.

matttye

Do you have a poor signal in your house?

When the screen is off the iPhone disconnects from WiFi after a few seconds to save battery (ironically), but if you have a poor signal the phone will constantly be connecting and disconnecting from the mobile network, which uses up a lot of battery.

Simple solution: charge overnight.

My battery isn't amazing either, took off charge at 9AM and it's now on 30% remaining. Better than any other phone I've had before though, including HTC Desire, Galaxy S2&S3.

Humphrey10

Turn off 3G, turn off location services, turn down brightness and turn off auto-brightness, turn off auto date/time. You can then try turning the ones you need on one by one to see if any are having a big impact on the battery - with the most recent iOS update auto date/time on my iPhone was causing massive battery drain for some reason.
Close all the apps you have open in the background.
Also this might help:
http://www.apple.com/uk/batteries/iphone.html

Humphrey10

Another tip to help you identify what is causing the battery drain - how much charge does the phone lose overnight?
It shouldn't lose more than a couple of percent - if it does, either the battery is screwed, or it's something auto set date/time or push email or something like that which it is repeatedly doing all the time, draining battery.