NEC Versa LXi Service And Reference Manual page 60

Note
installing another manufacturer's battery, or using a combination of very old and new batteries
can deteriorate battery and equipment performance.
Power off the system.
1.
Close the LCD and turn the system over.
2.
Slide the battery release latch toward the back of the system and hold firmly.
3.
Continue to hold the battery release latch as you slide the battery out of the system.
4.
3-10 Disassembly and Reassembly
Use the batteries in the NEC Versa computer for which they are designed. Also,
Locating the battery bay release latch
A – Battery Release Latch
Removing the battery