Type: A2208/17 No. Of cells:2-3 Li-Poly, 6-8 Ni-Mh/Ni-Cd RPM/V:1100 RMP/V Max. efficiency:80% Max. efficiency current:4-7A (>74%) No load current / 10 V: 0.6 A Current capacity:8A/60 s Internal Resistance: 225 mΩ Dimensions:27.5x26 mm Shaft diameter: 3.17 mm Weight:36g /1.27 oz