Power - Motorola MOTORAZR V3c Motomanual

Conserve Battery Power
Your phone includes an ambient light sensor
and battery save setting to extend battery life.
When this feature is activated, it automatically
turns off the keypad backlight when it detects
that enough ambient light is available.
Inhibiting or covering the sensor can cause
intermittent backlighting.
Find it: Press s > G Settings > Initial Setup
> Battery Save
48 Setting Up Your Phone