NEC Versa LXi Series Service And Reference Manual page 27

Insert the new battery as follows:
5.
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Locate the alignment groove on the edge of the battery.
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Locate the alignment groove inside the battery bay.
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Align the grooves on the battery with the grooves in the bay.
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Slide the battery into the bay until securely locked into place.
6. Turn over the system.
Inserting the battery
System Configuration and Setup 2-7