The kit is mounted like a 2.5 HDD. One hot-swap HDD bay per node will be occupied by the battery and kit. For all nodes you will need 4 kits total. You will lose 4 hard drive bays on the 4 nodes total. The nodes will no longer be hot-pluggable because of the cable connected to the battery.
Kit:
1) Battery: BTR-0018L
2) Mounting kit: BTR-0018L-KIT
Impact:
Once the cache batteries are added, the system nodes will NO LONGER be hot-swappable.