Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CR-123-A-BA-5123U found under by Systems Sunlight S A. The National Stock Number assigned to this part is 6135013511131, and the Federal Supply Class is 6135 Batteries Nonrechargeable. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CR-123-A-BA-5123U.