Battery2go - 1 year warranty - 3.7V Battery For Easypack 66590 711 099, EasyPack 550, EZPack S-3, Poliflex 550 Capacity: 500mAh / 1.85Wh Type: Li-ion Volts: 3.7V Size : 43.41 x 35.53 x 5.92mm