Motorola MD7090 - Manual (Page 24)

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Installing Backup Batteries
Four AA alkaline batteries (not included) can be
installed into the base as backup in case of a
power outage.
Note: The corded handset will work during power
outages with or without the backup batteries.
1 With the back of the base facing you, press the
cover latch to remove the battery compartment
cover.
2 Insert four AA alkaline batteries as directed on
the compartment.
3 Replace the compartment cover by inserting the
tabs of the cover into the slots on the base unit.
Press down until the cover clicks into place.