Amazon.com: NewPower99 Battery Replacement Kit for Logitech Craft Y-R0064 Keyboard with Tools, Video Instructions, Long Life Rechargeable Battery : Cell Phones & Accessories
Replacing the Batteries in Your Logitech K800 Wireless Keyboard – tech128
Synergy Digital Keyboard Battery, Compatible with Logitech G Pro Wireless Keyboard, (Li-Pol, 3.7V, 180mAh) Ultra High Capacity, Replacement for Logitech 533-000151 Battery - Walmart.com