Battery Precautions - NEC SX Service And Reference Manual

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Lower the battery into the battery compartment while at the same time
slide the battery lock lever out of the way and press gently to secure the
terminal connections. Release the lock latch and your NEC Versa
battery is installed.

Battery Precautions

To prevent accidental battery ignition, rupture, or explosion, adhere to the
following precautions.
2-8 System Configuration and Setup
Reinstalling battery