Motorola T900 User Manual page 9

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Holding the communicator (PIC) face down, slide the latch toward the
battery door. Slide the battery door in the direction of the arrow to
unlatch the battery door. Lift the battery door to open.
Remove the old battery, noting the polarity.
Insert a new battery so the positive (+) and negative (. ) polarity markings
on the battery match the polarity diagram near the battery compartment.
Replace the battery door cover and lock the battery door latch.
Caution: Note the polarity markings (+) and (-). Do not insert the battery
backwards. This causes all messages to be erased.
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