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
Amazon.com: Replacement for Logitech Harmony One Battery - Fully Compatible with F12440023, Kardon TC30, 190304200, 190304-200, 1903042001 - (950mAh Li-ion) : Electronics
Kastar 4-Pack Battery and LTD2 USB Charger Compatible with Logitech Harmony 895 Harmony 900 Harmony 900 Pro Harmony 900 Remote Harmony One Advanced MONSTER AV100 MONSTER AVL300 MONSTER AVL300S - Walmart.com