BNA-B0002 Battery for Barnes & Noble BNRV400, BNTV400, Nook HD 7 Tablet 3.7V, Li-Polymer, 4000mAh Fits Model: BARNES & NOBLE BNRV400, BNTV400, NOOK HD 7 tablet Part Number: BARNES & NOBLEBNA-B0002, L83-4977-266-01-4 Highest Quality Cells and Components 2 YEAR WARRANTY