Press fn + the battery key. This will cause the LED indicator to flash one of the following three ways:
1. Three flashes = full battery life.
2. Two flashes = approximately half battery.
3. One flash = low battery. When your Rugged Messenger reaches critical battery level, the LED will flash once every five minutes.
To help preserve battery life, your Rugged Messenger will enter sleep mode if left on and not used for several minutes; press any key to wake it. The Rugged Messenger’s battery has no memory and may be charged whenever you wish. For optimal battery life, turn your Rugged Messenger off when not in use for a prolonged time.