HP BL860C - Manual (Page 131)

6. CAUTION: The BBWC battery must remain connected to the cache module to preserve the
data when removing the cache module to transfer data.
If replacing the battery, unplug the battery cable from the cache module.
Figure 60 Disconnecting the BBWC Cable from the Cache Module
7. Remove CPU 0.
See “Removing a Processor” (page 116) .
8. Starting from the end near the rear of the server blade, pry the BBWC battery off the chassis.
Figure 61 Removing the BBWC Battery
Removing and Replacing the Low Profile Battery Backed Write Cache (BBWC) Battery 131