Kastar Replacement Battery Pack for Logitech Harmony 900 Remote Harmony One | eBay
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
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Harmony Remote Batteries
Amazon.com: Harmony One Battery by AVIMABASICS - Replacement Part Compatible with Logitech Harmony One, 720, 850, 880, 885, 890 Pro, H880 Advanced Universal Remotes - Parts: 190304-0000 (950mAh 3.7V Li-ion) : Electronics