Omron NT-series Programmable Terminal V022-E3-1 - Manual (Page 264)

Reference
Caution
Note

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Section 7-3
3. Pull out the battery together with the connector.
4. Install a new battery.
Insert the battery connector, keeping it straight.
5. Close the CFL case lid and secure it with the screw.
The battery may be replaced while the power is ON. In this case, there are no re-
strictions on battery replacement time.
Never short the + and -- terminals of the battery. Do not recharge, take apart, de-
form, or discharge it into open flame.
Attempting any of these will lead to hazards such as fire, leakage of electrolyte,
rupture, etc.
When replacing a battery, ensure that the battery terminal does not touch the
board in the NT600S.