Amazon.com: Synergy Digital Remote Control Battery, Compatible with Logitech Harmony One Remote Control, (Li-Ion, 3.7V, 950 mAh) Ultra High Capacity Battery : Electronics
Genuine Logitech R-IG7 Li-ion Battery Harmony Remote ONE 720 880 895 900 NEW | eBay
Remote Control Battery 533-000084, 1209, 533-000083 for LOGITECH 915-000198, Harmony Touch, Harmony Ultimate,
Logitech Harmony One Universal Remote Control Charger Power Adapter No Battery | eBay
How To Change The Harmony Elite Remote Battery With The Best Tools And Parts EASY - YouTube