Lenovo B4400 Notebook - Manual (Page 35)

Appendix. CRU (Customer Replaceable Units) instructions
31
Replacing the backup battery - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
To replace the backup battery, do the following:
1 Turn off the computer, then disconnect the AC power adapter and all
cables from the computer.
2 Close the computer display, and then turn the computer over.
3 Remove the battery pack.
4 Remove the Hard disk drive/Memory/Mini PCI Express Card slot
compartment cover.
a.Loosen the screws that secure the compartment cover .
b.Remove the compartment cover .
a
b
b
a