NEC Versa LXi Service And Reference Manual page 29

5. Insert the new battery as follows:
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Turn over the system.
6.
2-8 System Configuration and Setup
Locate the alignment groove on the edge of the battery.
Locate the alignment groove inside the battery bay.
Align the grooves on the battery with the grooves in the bay.
Slide the battery into the bay until securely locked into place.
Inserting the battery