Cameron Sino 1300mAh Battery 533-000128, 623158 for Logitech 915-000257, 915-000260, Elite, Harmony 950 - AliExpress
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
How to Remove Harmony Elite Back if you need to Replace Battery - Logitech Harmony Elite - YouTube