IBM 7383 Installation And Service Manual page 94

5. Install the battery/flash power module:
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System x3500 M4 Type 7383: 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/flash power module cable connector with the slot on the
battery/flash power module holder. Place the battery/flash power module
into the battery/flash power module holder and make sure that the
battery/flash power module holder engages the battery/flash power
module securely.