Synergy Digital Speaker Battery, Compatible with Logitech 533-000146 Speaker Battery (Li-ion, 7.4V, 3400mAh)
Specifications: Voltage: 7.4V Capacity: 3400mAhmAh Composition: Li-ion
Compatible with Logitech Speaker(s): 533-000146, 084-000845, 984-001362, Megaboom 3, S-00171, Ultimate Ears Megaboom 3