How to replace battery SB821 with SB822 connected with PM864 online

How to replace battery SB821 with SB822 connected with PM864 online,
Does anyone have did this online?
Seeking suggetions or procedures to do it.

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Yes, This can be done online as the SB822 battery unit is used to provide extended memory back-up for the AC 800M Controller only in case of the Controller 24VDC supply failure.
Also remember, SB822 is rechargeable one, which needs 24VDC supply. which is not the case with SB821.

Regards.

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