NEC POWERMATE VT 300 Manual page 191

Battery Replacement
A lithium battery in some computers maintains system configuration
information. In the event that the battery fails to maintain system
configuration information, NEC recommends that you replace the battery.
For battery replacement information, see "Battery Replacement" in Chapter
5 of this guide or call your NEC CSD dealer or the NEC CSD Technical
Support Center.
WARNING: There is a danger of explosion if the battery is incorrectly
replaced. Replace only with the same or equivalent type recommended by
the manufacturer. Discard used batteries according to the manufacturer's
instructions.
ADVERTISSEMENT: Il y a danger d'explosion s'il y a replacement
incorrect de la batterie. Remplacer uniquement avec une batterie du même
type ou d'un type recommandé par le constructeur. Mettre au rébut les
batteries usagées conformément aux instructions du fabricant.
Battery Disposal
Do not place used batteries in your regular trash.
The nickel-cadmium or nickel metal-hydride batteries must be collected,
recycled, or disposed of in an environmentally-approved manner.
The incineration, landfilling, or mixing of batteries with the municipal solid
waste stream is prohibited by law in most areas.
Return batteries to a federal or state approved battery recycler. This may be
where your purchased the battery or a local seller of automotive batteries.
Contact your local waste management officials for other information
regarding the environmentally sound collection, recycling, and disposal of
the batteries.