Replace your Logitech MX Keys Advanced Wireless Illuminated Keyboard Battery also known as MX Keys Keyboard model Y-R0073 or Keep an Extra Battery on hand as a backup. This is an Extended Capacity 1500 mAh, Lithium Polymer Rechargeable Battery. Works in your Logitech MX Keys Wireless Keyboard. Compatible with Logitech MX Keys YR0073 Keyboard. Simple, Easy and Inexpensive! You get a New Battery, an Instructional Battery Replacement Video, Tools for Battery Installation, AND You also get a full ONE YEAR Money Back Guarantee exclusively when you purchase from us.