8. Close the SAS cable guide cover.
9. Press the tray retention clip tab outward to release the retention clip that
secure the batteries and flash power modules in the battery/flash power
module trays (on the top of the USB/video assembly near the front of the
server).
10. Place the RAID battery or flash power module into the battery/flash power
module tray (install the batteries or flash power modules in the trays starting
from top to bottom).
Note: If the RAID cache card is installed in the connector on the system
board, place the battery or flash power module in the battery/flash power
module tray slot closest to drive bay 0.
88 System x3750 M4 Types 8722 and 8733: Installation and Service Guide