Best Buy: Logitech Harmony Smart Control (Remote Control and Smart Hub) Black 915-000194
Harmony Remote Batteries
Amazon.com: Empire Remote Control Battery, Works with Logitech HARMONY TOUCH Remote Control, (li-ion, 3.7V, 1100 mAh) Ultra High Capacity Battery : Health & Household
Logitech Harmony Companion review: Remote really ties the room together - CNET