Not so great: Outside control, Multi-touch, and Battery Life - The Logitech Harmony Elite Experience: Ultimate Control
Harmony Remote Batteries
Amazon.com: Synergy Digital Remote Control Battery,Compatible with Logitech Harmony Touch Remote Control, (li-ion, 3.7V, 1100 mAh) Ultra High Capacity Battery : Health & Household
Logitech Harmony One Remote Battery Replacement - YouTube