Lenovo B4400 Notebook - Manual (Page 36)

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Appendix. CRU (Customer Replaceable Units) instructions
5 Disconnect the backup battery cable connector , then pull the backup
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.
a
b
b
a