Tune performance
Optimize battery life
You can extend your battery's life between charges by turning off features that you don't need. You can also monitor how apps and system resources consume battery power.
To adjust the settings described here, first touch the Settings icon 
on a Home or All Apps screen.
Extend the life of your battery
GIf you aren't using
GDon't leave the Maps or Navigation apps open on the screen when you're not using them. They use GPS (and thus more power) only when they're running.
GTurn down screen brightness and set a shorter Sleep timeout: Settings > Device > Display.
GIf you don't need it, turn off automatic syncing for all apps: Settings > Personal > Accounts & sync. Note that this means you need to sync manually to collect messages, email, and other recent information, and won't receive notifications when updates occur.
GIf you know you won't be near a mobile or
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