Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C18.1 found under Battery Nonrechargeable by American National Standards Inst. The National Stock Number assigned to this part is 6135006431310, 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 C18.1.