Lenovo ThinkPad X131e User Manual page 98

5. Detach the connector
To install the backup battery, do the following:
1. Install the backup battery
2. Attach the cover 1
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User Guide
1 . Then remove the backup battery
1 . Then attach the connector
and pivot it downwards
2 .
2 .
2 . Then tighten the screws 3 .