IBM System x3300 M4 Installation And Service Manual page 106

9. Install the battery:
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System x3300 M4 Type 7382: Installation and Service Guide
Attention: Make sure that the cable is not pinched and does not cover any
connectors or obstruct any components on the system board.
a. Align the battery cable connector with the slot on the battery holder. Place
the battery into the battery holder and make sure that the battery holder
engages the battery securely.