Welcome to the forum..............D Series Controllers requires 1x lithium single cell rated @ 3.6v 2750mAh for the 1KA/1RA CPU Board for SRAM backup.
Robot Arm Encoder Batteries requires a 2x lithium single cell connected in parallel rated @ 3.6V 2750mAh each.You can still obtain these from any Kawasaki Distributor ready to go.
Where would the arm encoder batteries be located at on a FS30?