For access, remove:
Following components soldered on the system board are extremely sensitive. When you service the system board, avoid any kind of rough handling.
[a] SSD (Solid State Drive)[b] ICH (I/O Controller Hub)[c] On-board 512 MB memory[d] CPU[e] MCH (Memory Controller Hub)[f] SSD controller
DANGER: Use only the battery specified in the parts list for your computer. Any other battery could ignite or explode.
Removal steps of backup battery
When installing: Make sure that the battery connector is attached firmly.