IBM RS/6000 44P 270 Service Manual page 268

7. Pry the battery out of its mount using your fingernail or small blunt object. After the
top of the battery has cleared the plastic mount, pull it up and out of the system
unit.
Note: You may need to pry the battery out of the mount after the top of the
8. Ensure that the battery polarity is correct. With the positive (+) side of the battery
facing the memory module connectors, insert the battery between the front and
rear battery mount clips.
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Service Guide
battery has cleared the battery mount. Do not wiggle the plastic mount from
side to side or try to separate the plastic battery mount from the system
board. The plastic mount connections are soldered to the system board.
Permanent damage can result to the system board if the battery mount is
damaged or removed.