Replace your Logitech k810 Keyboard Battery or Keep an Extra Battery on hand as a backup. This kit comes with a High Capacity, High Quality 1500 mAh, Lithium-Polymer Battery that offers up even more up time than your original. Works in your Logitech Bluetooth Illuminated K810 Keyboard. 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 our Logitech k810 Keyboard Battery Replacement Kit.