User manual Logitech Harmony 900 (English - 59 pages)
950mah R-ig7 Battery With Charger For Logitech Harmony One, 900, 880, 890, K43d, M36b, Avl300, 720, Nta2340, Mcc, Av100, Hr880 - Digital Batteries - AliExpress
Battery for Logitech HARMONY 900 TV Remote
Amazon.com: Synergy Digital Remote Control Battery, Works with Logitech Harmony 900 Pro Remote Control, (Li-Ion, 3.7V, 950 mAh) Ultra High Capacity Battery : Electronics
Replacement for Logitech Harmony 900 Battery - Compatible with Logitech Universal Remote R-IG7 Battery (950mAh 3.7V Lithium-Ion)