10 reasons why your phone battery keeps dying

You've got Wi-Fi and GPS enabled

If you've got Wi-Fi and GPS enabled, your mobile phone is always going to be trying to connect to a network.If you're out on a country walk or anywhere that is unlikely to have a Wi-Fi connection you'll want to use, disable this feature. Scanning for Wi-Fi is one of the most battery-intensive tasks your phone does: only voice calling, some games and watching video use up more battery.