NEC HX4500 Service & Reference Manual page 84

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Replacing the Non-Volatile Memory
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Danger of explosion if the battery is incorrectly replaced. Replace
only with same or equivalent type recommended by manufacturer.
Dispose of lithium batteries as required by local ordinance or as
normal waste if no local ordinance exists. Do not expose the
component to excessive heat or fire. Keep all batteries away from
children.
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4-12 Assembly and Disassembly Procedures
Observe static precautions. Use an antistatic wrist strap.
! CAUTION
Observe static precautions. Use an antistatic wrist strap.