VINTRONS Rechargeable Battery 1800mAh For Spectralink Polycom LTB100, Link 6020, 8020, 8030, BPL300, Avaya 3641 Capacity: 1800mAh / 6.66Wh Type: Li-ion Volts: 3.7V Size : 61.90 x 38.00 x 14.20mm