Replace your Microsoft Surface RT 1515 or 1516 Battery or Keep an Extra Battery on hand as a backup. This kit comes with a 4250 mAh, Lithium-Polymer Battery. Works in your Microsoft Surface RT model 1515 or 1516 (Surface RT 1st Generation) Tablet. Simple, Easy and Inexpensive! You get a New Battery, an instructional Video, Special Tools needed for battery installation, AND You also get a full ONE YEAR Money Back Guarantee exclusively when you purchase our Microsoft Surface RT model 1515 or 1516 Surface RT 1st Generation Battery Replacement Kit.