You install the battery that you removed from the original controller canister or a new battery that you ordered.
Perform the following steps for each controller in the controller-drive tray.
When the latch clicks into place, the bottom of the latch hooks into a metal slot on the chassis.
Slide the battery into the canister, making sure it stays below the rivets on the wall of the new canister.
When the latch clicks into place, the bottom of the latch hooks into a metal slot on the chassis.