Replace your NOOK HD 7 BNTV400 or BNTV400A Battery or Keep an Extra Battery on hand as a backup. This kit comes with an instructional Video on How to Replace your NOOK HD model BNTV400 Tablet or BNTV400A Tablet Battery, FREE Tools (necessary for installation), and a High Capacity 4000 mAh, Lithium-Polymer Battery that works in your Barnes and Noble NOOK HD 7 BNTV400 and BNTV400A tablets. Simple, Easy and Inexpensive! You get a New Battery, FREE Tools (necessary for installation), Video Instructions AND You also get a full ONE YEAR Money Back Guarantee exclusively when you purchase our Barnes and Noble NOOK BNTV400 and BNTV400A Battery Replacement Kit.