Position the battery under the battery retainer and slide the battery in until seated.
Install the riser card assembly. Position the riser card assembly over the connector using rear alignment tab as a guide. Be careful to properly align the connector them press down to seat it.
Return the system to the operational position. Carefully rotate the drive bay assembly to the closed position, ensuring the cables are properly routed in the bay to avoid damage.
Close the top cover. Rotate the cover down until secured by the latches.