Use Battery Saver mode

Battery Saver helps you keep going on a low battery by automatically restricting mobile data until the next charge. Some apps and services won’t work unless you’re connected to a Wi-Fi network.

1. Swipe the status bar down with two fingers and touch .

   TipOr, on the DROID Command Center widget, touch the battery.
2. Next to Battery Saver, slide the switch to ON.