SB821 External Battery Unit Section 5 Maintenance
124 3BSE 027 941 R301
Changing the Battery in an SB821 External Battery Unit
To change an external battery:
1. Disconnect the SB821 unit cable connector.
2. Release the SB821 unit from the DIN-rail.
3. Carefully remove the SB821 unit cover and identify the external battery.
4. Read and comply with the Warning label/text on the external battery.
5. Carefully remove the battery.
6. Insert a serviceable battery and check that battery polarity and orientation are
correct. For further battery details see SB821 External Battery – AC 800M
Memory Back-up on page 193.
7. Replace the cover, mount the unit onto the DIN rail, and reconnect the cable.
8. When power is re-established, check that the B(attery) LED lights up.
9. Dispose of the run-down Lithium battery in an approved manner.
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