Technical data: Voltage: 3.7 Volt Capacity: 140mA / 0.54Wh Type: Li-Polymer The battery is suitable for the following models: Sennheiser IS 410, RI 410 Sennheiser: RR 840 headphones, RS 4200 Sennheiser: Set 830 TV, Set 840 TV, Set 840-S, Set 900 This battery replaces the following battery types: Sennheiser BA-300, HC-BA300, NCI-PLS100H, P/N 523306, 500898