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7
Getting started
Backup battery charging
If the deskset loses power but you have installed the backup battery, the 
screen indicates the battery status (see table below) and displays 
Check AC power. Refer to the Deskset installation on page 5 for 
reconnecting the deskset with the power adapter. If it is in low battery mode, 
the screen displays Low battery. The backup battery is fully charged after 16 
hours of continuous charging. See the table on page 83 for battery 
operating times.
The following table summarizes the battery charge indicators and actions 
to take.
Battery indicators
Battery status
Action
The screen shows 
Low battery and 
flashes.
Battery has enough 
charge to be used for a 
short time.
Charge without 
interruption at least one 
hour.
The screen 
shows
.
Battery is fully charged.
To keep the battery 
charged, keep the 
adapter plugged into 
the jack at the bottom 
of the deskset.