Amazon.com: Synergy Digital Remote Control Battery,Compatible with Logitech Harmony Touch Remote Control, (li-ion, 3.7V, 1100 mAh) Ultra High Capacity Battery : Health & Household
Logitech Harmony One Swollen Battery Removal - YouTube
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Remote Control Battery R-ig7,f12440023,k43d,m36b,m41b,190304-200 For Logitech Harmony One, 720,780,785,880, 885,890,895,900, Pro - Digital Batteries - AliExpress