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
Logitech Harmony 900 Remote Control Battery RLI-001-.9 Li-Ion 3.7V (950 mAh) Battery - Replacement For Logitech R-IG7 and Monster MCC - Walmart.com