HP Compaq 6820s Maintenance And Service Manual page 71

If it is necessary to replace the battery connector board (1) and the optical drive connector board
7.
(2), remove them from the connectors on the system board. The battery connector board is available
using spare part number 457620-001. The optical drive connector board is available using spare
part number 456805-001.
Reverse the preceding procedure to install the system board.
Component replacement procedures 63