No. Of cells: 3-4 Li-Poly/ 8-12 Ni-Mh/Ni-Cd RPM/V: 950 RMP/V Max. efficiency:81% Max. efficiency current:9-16A (>75%) No load current / 10 V:0,5 A Current capacity:25A/60 s Internal Resistance: 84 mΩ Dimensions:27.5x30 mm Shaft diameter: 4 mm Weight:72 g