Turn off Bluetooth
If you are not using Bluetooth then turn it off. most of us forget to turn of it and consume charges of battery continuously. When you need then turn it on and thus save your phone battery life. This also help you to prevent to be hacked by others through Blutooth hacking technology.
Turn-off wireless connection
Like Bluetooth, Wi-Fi and other wireless connection less your battery life. So if you are not in a place where Wi-Fi is available, turn off it and extend your phone battery.
Network Coverage
In no network or low network coverage area your phone uses more battery charges to establish the connection. If you are in a place of low network coverage or no network then turn-off your phone or turn-on its flight mode.
Recharge time
Try to recharges your phone battery after 3/4 of battery chages are dischared to improve battery performance and lifespan.
Games
When you play games, your battery charges are decreased rapidly and there is no way that allow the screen to dim. So try to play games less as much as you can.
Wallpaper/Screensavers/themes
Too much animated wallpaper and screensavers or thems use huge battery charges. So try to keep your phone screen as simple as possible.
Vibration
Vibration also uses too much battery charges. So if it is not needed then turn this feature off.
Over heating
Too much temperature causes many problems for phone battery. The allowable temperature range is 10 - 35 C