Buy the Logitech Harmony One for Parts and Repair | GoodwillFinds
Logitech Harmony One Teardown - iFixit
Amazon.com: Logitech Harmony Companion All in One Remote Control for Smart Home and Entertainment Devices, Compatible with Alexa (Renewed) : Electronics
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