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
Amazon.com: Technical Precision Replacement for LOGITECH Harmony Ultimate N-R0007 Remote Control Battery : Electronics
Amazon.com: FITHOOD Replacement Battery for LOGITECH Harmony Ultimate Harmony Touch 915-000198 1209 533-000083 533-000084 Harmony Ultimate One : Health & Household