This is the battery for many HP Smart Array controllers. It is widely compatible in both G9 and G10 servers. Close to the backplane you’ll notice a small notch. This notch accepts the tab seen on the battery. It is then further held in usually by a blue clip. The wire connects straight to the motherboard. Functionally, this battery maintains the RAID cache in the event of power loss.
Archives: Parts
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HP DL 380 G9 8 Bay Backplane 777279-001
This is the backplane for the HP DL 380 G9 8 bay server. It is attached to the chassis with 2 screws and connects to the motherboard with the following power cable.
Here is a picture of the other side:

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HP G9 Backplane Power Cable 747560-001
This is the power cable that attaches from the backplane to the motherboard. It is specific to the HP DL 380 G9 8 Bay server.
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HP Smart Array Cable 747568-001
This cable attaches from the backplane to a compatible smart array controller in the HP DL 380 G9 server. It is specific to the 8 bay chassis.

