Lenovo B4400 User Manual page 36

Appendix. CRU (Customer Replaceable Units) instructions
5 Disconnect the backup battery cable connector
battery upward to remove
6 Install a new backup battery.
7 Reinstall the compartment cover and tighten the screws.
8 Reinstall the battery pack.
9 Turn the computer over again.
0 Connect the AC power adapter and the cables to the computer.
32
.
b
b
a
a
, then pull the backup