Logitech Replacement Harmony One Remote Battery Door Cover
Harmony Remote Batteries
Harmony Ultimate One Battery - Logitech Harmony Ultimate One Battery - Spare Module Type Logitech Harmony Ultimate One Replacement Lithium Ion (Li-Ion) Remote Control Battery – CutRateBatteries.com
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