Fanuc A98L-0031-0004 Battery. This can be a Fujitsu LR6 in a 1.5V AA cell size or a LR6(c) Alkaline Battery. These are freely available. DNC does carry these batteries , but our advice would be buy them from your local Battery source, etc. Normally three of these batteries are used to backup the MEM pcb’s memory for Fanuc 0-C, 0-Mate-C, 0-D, 0-Mate-D, 15A. This Battery has an alternate catalog number in the Fanuc maint manuals of A02B-0094-K131.