Amazon.com: Synergy Digital Remote Control Battery, Compatible with Logitech Harmony Ultimate One Remote Control, (Li-ion, 3.7V, 1050mAh) Ultra High Capacity, Replacement for Logitech 533-000083 Battery : Electronics
Amazon.com: Logitech Harmony Ultimate One Remote - Discontinued by Manufacturer : Electronics
Logitech Harmony One Remote Battery Replacement - YouTube
How to Replace Battery in Harmony Remote Remote Touch / Ultimate / Elite - YouTube