Amazon.com: Replacement for LOGITECH MX-880 MX-890 Harmony One F12440023 NTA2340 One Harmony 900 Harmony 880 Harmony 890 Harmony 720 R-IG7 Harmony 900 Remote Battery : Health & Household
Battery for Logitech Harmony 720, Harmony 720 Pro / 1903040000,NC1002,R-RG7 3.7V | eBay
How to Replace Battery in Harmony Remote Remote Touch / Ultimate / Elite - YouTube
Amazon.com: Cameron Sino This Battery fits Logitech Harmony 950 915-000260 Elite 915-000257 Replacement and Spare and is Compatible with Logitech 533-000128 623158 : Electronics