Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
Text excerpt from page 22 (click to view)
Level III Service Manual
Disassembly
3. 4.
Lift the battery housing completely off the phone. Lift the end of the battery and remove it completely. See Figure 6.
BATTERY
010626o
Figure 6. Removing the battery There is a danger of explosion if the Lithium Ion battery is replaced incorrectly. Replace only with the same type of battery or equivalent as recommended by the battery manufacturer. Dispose of used batteries according to the manufacturer�s instructions. 5. 6. 7. To replace, Align the battery with the battery compartment so the contacts on the battery match the battery contacts in the phone. Insert the battery, printed arrow first, into the battery compartment and push down. Insert the ridge at the bottom of the battery housing into the base of the phone, then push the cover down and snap it into place.
