Cisco CGR1240 Replacing Manual page 8

Replacing FRUs in a Spare CGR Chassis
Detailed Steps to Replace the Chassis
Figure 8 N-Connector Cap
Figure 9 N-Connector
Figure 10 Zip Tie Locations on Share Chassis
Step 4. Swapping Battery Back Up (BBUs) from Old to New Chassis
Before swapping the BBUs in the CGR 1240, Cisco recommends the following:

Best practice is to replace all of the BBUs.
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Verify that all of the BBUs are the same version
Swapping out the BBUs requires the use of a #1 Phillips head screwdriver.
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