NEC POWERMATE PROFESSIONAL 9000 User Manual page 261

!
The battery can explode if it is incorrectly replaced
or improperly discarded. Use only the same battery
or an equivalent type recommended by the
manufacturer when replacing the battery.
Lithium acts as a catalyst when exposed to water
and causes spontaneous combustion on contact.
Discard used batteries
manufacturer's instructions.
If you need to replace the battery, follow these steps:
1. Turn off and unplug the computer and any external
components connected to it.
Remove the system unit cover (see "Removing the
2.
System Unit Cover" in Chapter 5). Observe all safety
precautions when removing the cover.
Slide the system board out of the chassis (see
3.
"Removing the System Board" in Chapter 5).
WARNING
according to
Solving System Problems 8-9
the