Logitech Harmony Ultimate Battery for Remote Control
UltraLast Rechargable Lithium-Ion Replacement Battery for Logitech Harmony 1000 Remote Control URC-LOG1000 - Best Buy
Amazon.com: Synergy Digital Remote Control Battery, Compatible with Logitech Harmony Ultimate One Remote Control, (Li-ion, 3.7V, 1050mAh) Ultra High Capacity, Replacement for Logitech 533-000083 Battery : Electronics
How To Change The Harmony Elite Remote Battery With The Best Tools And Parts EASY - YouTube