Remote Control Battery R-ig7,f12440023,k43d,m36b,m41b,190304-200 For Logitech Harmony One, 720,780,785,880, 885,890,895,900, Pro - Digital Batteries - AliExpress
Synergy Digital Remote Control Battery, Compatible with Logitech 915-000198, Harmony Touch, Harmony Ultimate, Harmony Ultimate One Remote Control Battery (3.7, Li-ion, 1050mAh) - Walmart.com
Logitech Harmony 720 Harmony 720 Pro Harmony 720 P Replacement Battery: BatteryClerk.com Remote Control