Battery for Logitech Harmony 720 Pro Harmony 880 Pro Harmony 900 Harmony One | eBay
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 : Health & Household
Portable Emergency AA Battery Charger Extender suitable for the Logitech Harmony 900 - with Gomadic Brand TipExchange Technology - Walmart.com
CS Remote Control Battery for Logitech Harmony One 720 Pro 880 Pro 890 Pro 900 Remote 785 880 885 89 Fits 1903040000 M36B M41B