Start with the wider ribbon cable from the grip panel. Position the cable end properly by hand or with plastic, dull tweezers, then insert it into the connector under the open black lid.

Once the cable is inside the connector, pull down the black lid to close it. The cable should be securely in place.

Tuck in the excess of the ribbon cable underneath the printed circuit board, slightly rolling it into the pocket underneath.

Use tweezers to wrap the smaller ribbon cable around the battery, and insert it into its connector closer to the top of the printed circuit board.