Replace your Sony PRS-350 Battery or Keep an Extra Battery on hand as a backup. This kit comes with an Extended Capacity 900 mAh, Lithium-Polymer Battery that offers up even more up time than your original. Works in your Sony PRS-350, PRS-350/SC 300/BC, or 300/RC e-reader. You get a New Battery, Free Tools (necessary for installation), Video Instructions and You also get a full One Year Guarantee exclusively when you purchase Innovate88's Sony PRS-350 Battery Replacement Kit.