T-Mobile TM1393 - Manual (Page 60)

Section 1, page 56
Managing Power and Battery Life
You can adjust several settings on your device to reduce power drain and extend
battery life.
1. On the Home screen, select Start > Settings.
2. Scroll to and select
More.
3. Scroll to and select Power Management.
4. Scroll to the following and press the Left or Right Navigation key to adjust:
Backlight time out on battery
Backlight time out on AC Display time out
5. Select Done > Done