Avago Technologies 3ware 9550SXU-4LP - Manual (Page 31)

Installation Instructions
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3 Press down gently until the BBU is seated.
Figure 24. BBU control module connected to the controller
4 Turn the controller over, insert the plastic screw head that you
removed in step 1 into the plastic post, and tighten it gently but
firmly. (Do not over-tighten!)
Warning! To avoid possible damage to the controller
and the motherboard, make sure the module is
connected in the proper orientation, and that the
plastic post is attached.
When the plastic post and the connector are attached
correctly, the module is in the correct orientation.