Choose Settings –> Battery or tap the battery icon in your Quick Settings. It can also go by the name Battery Saving Mode as well as other variations. If you have an LDC screen, look for alternative methods on how to increase the battery life for Android phones.
The darker wallpaper theory does not seem to apply to phones with LCD screens, because of how light fiters through the screen. You can also switch to more AMOLED-friendly apps, such as Sync for Reddit. One test posted on the XDA website showed battery life gain of about three hours. If your phone has an AMOLED screen, using black or darker wallpaper can reduce consumption of battery surprisingly well. You can also go to Settings –> Display –> Wallpapers –> Disable Animation/live wallpaper. Avoid applications with animated wallpapers as well. They can be gorgeous, but if you need to save your battery, consider compromising by not using animated wallpapers.
Live wallpapers run in the background every time you unlock your mobile. And if you still have your warranty or a replaceable battery, see about getting a new one. Try performing a factory reset if nothing else works. Take it easy for awhile if your phone gets too warm. Heaving gaming can be hard on the battery and can cause overheating.
