Amazon.com : HQRP Battery Compatible with Logitech Harmony 720, 850, 880, 885, 890 Pro, H880, 900 994-000033, F12440023, K43D, M36B, M41B, R-IG7 Replacement : Digital Camera Batteries : Electronics
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
Logitech Harmony Battery Charger Cradle 890 880 720 One 895 885 785 Wireless DJ | eBay
Remote Control Battery R-IG7,F12440023,K43D,M36B,M41B,190304-200 for Logitech Harmony One, 720,780,785,880, 885,890,895,900, Pro
2x Battery for Logitech R-IG7 Remote Control 720 850 880 885 900 Harmony One | eBay
950mAh R-IG7 LOH880 Remote Control Battery and LED Charger for Logitech Harmony One, 900, 720, 850, 880, 885, 890 Pro, H880 - AliExpress