Synergy Digital Remote Control Battery, Compatible with Logitech 915-000198, Harmony Touch, Harmony Ultimate, Harmony Ultimate One Remote Control Battery (3.7, Li-ion, 1050mAh) - Walmart.com
Logitech Harmony Companion review: Remote really ties the room together - CNET
Logitech Harmony Elite review: Touchscreen remote gives you total control, for a steep price - CNET