You can try below mentioned tips to increase battery life of your Android phone:
If you are using apps, then only use apps that are important for you and uninstall the unused apps from your phone, because they are eating your battery power in the background.
If you are surfing internet, then only Switch ON your mobile data when you need it and after your work is done, then Switch OFF the mobile data. Also, do not always get connected all the time with wi-fi, even that also consume high amount of power of the battery.
Other basic things that you should always perform are that set the brightness to low and turn of automatic brightness. Remove live wallpaper if you are using it and set black simple wallpaper. These all consume high amount of battery power.