Siemens HiPath 4000 Operating Instructions Manual page 16

Putting the handset into service
2. Open the battery compartment
Reach into the cavity on the housing and lift up the battery cover.
3. Insert the battery
Insert the battery ensuring that the contacts meet.
4. Close the battery compartment
First, align the protrusions on the side of the battery cover with the notches
on the inside of the casing. Then press the cover until it clicks into place.
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