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To check the battery gauge • Locate the gauge on the back of the battery and press the button. The indicator lights show the remaining charge. Each light represents approximately 20% of the total charge. Press 36 Chapter 3 Using the system Charging the battery When the system is connected to AC power, the battery automatically charges until it reaches full charge, whether the unit is on or off. For information about the battery status light on the front of the unit, see “Status lights” on page 1