Amazon.com: hflexgrad (2-Pack) 3.7V 950mAh Li-ion Rechargeable Battery Replacement for Logitech Harmony One, 720, 850, 880, H880, 880 Pro, 885, 890, 890 Pro, 900, 900 Pro R-IG7, NTA2340 Remote Control Series : Electronics
Amazon.com: Youejoeq (2-Pack) logitech r-ig7 Battery Replacement for logitech Harmony one 900 850 880 885 890 Pro H880,fit Part no R-IG7 190304-0000 f12440023 : Electronics
How to Replace Battery in Harmony Remote Remote Touch / Ultimate / Elite - YouTube
Amazon.com: AVIMABASICS Harmony One Battery 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