Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BTP-451165-B1 found under Retainer Battery by Bren Tronics Inc. The National Stock Number assigned to this part is 6160016654976, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BTP-451165-B1.