Logitech Harmony One Remote Battery Replacement - YouTube
Remote Control Battery R-IG7,F12440023,K43D,M36B,M41B,190304-200 for Logitech Harmony One, 720,780,785,880, 885,890,895,900, Pro
Harmony Remote Batteries
Swollen Battery in your Logitech Harmony One?
Amazon.com: Synergy Digital Remote Control Battery, Compatible with Logitech Harmony One Remote Control, (Li-Ion, 3.7V, 950 mAh) Ultra High Capacity Battery : Electronics