One of the most frequent question among Galaxy S3 users. Tips to get a full day out of fully charged GS3 . Try a combination which you are comfortable to suit your usage
Power safe mode
This should be the first thing to try. Can be easily enable and disable via notification bar
Enable automatic brightness or reduce brightness to a comfortable level. Also set the colour profile "Screen mode" to Standard
Turn off Wifi, GPS and Bluetooth
Enable these features when you need to use them, since enabling them consume a lot of power, so use wisely
Use darker wallpaper has it consume less power than brighter and lighter background. Also avoid using live wall paper as they consume more power.
Manage widget wisely - the more widget you run, the more power you consume. Uninstall widget that you do not use.
Screen time out
Set screen time out between 15 - 30 seconds is ideal
Close app running in the background
When you exit an app, the app is still running in the background. Periodically go to the task manager and close all the apps
Close built-in apps
Disable unused bundle apps like ChatOn, S Voice and Hub
Disable motion sensor
Disable motion feature like Smart alert, Direct call etc can reduce power consumption
- Manage auto-sync
Auto sync feature in Gmail, Facebook, Twitter tend to consume power. So by reducing or disabling auto-sync can save power.
You can also try Flipboard app which combines News, Facebook, Tweeter, Instagram in one app, rather than having 4 apps running in the background.