Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D381 391B found under Battery Nonrecharge by Duracell Inc. The National Stock Number assigned to this part is 6135012460308, 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 D381 391B.