FX2 CMC Battery Replacement

We received an email alert from our FX2:

Event Message: The CMC 1 battery has failed.

Detailed Description: System settings may be preserved if input power is not removed from the power supplies.

Recommended Action: Check the battery.

Message ID: BAT0017

Are we able to remove the CMC and replace the battery without powering down any of the 4 blades in the chassis? 

Anyone know what kind of battery it is?

Thank you