Synergy Digital Remote Control Battery, Compatible with Logitech Harmony 900 Pro Remote Control, (Li-ion, 3.7V, 950mAh) Ultra High Capacity, Replacement for Logitech 190304200 Battery Specifications: Battery Chemistry: Li-ion Voltage: 3.7V Capacity: 950mAh Compatible with: Logitech 190304200 Battery Works for: Logitech Harmony 900 Pro Remote Control and many moreLong Lasting, Ultra Hi-Capacity Battery – Limited 3-Year Warranty. This battery is made with high quality Japanese cells, it is designed to meet or exceed the original battery performance. Li-ion, 3.7V, 950mAh. Works for Logitech Harmony 900 Pro Remote Control and many other models. Rechargeable Battery Compatible with Logitech 190304200.