ENGWE 20 4 1000W 48V/26Ah Dual Batteries Electric MountainBike Bicycle All-Terrain Ebike. ENGWE M20 Electric bicycle--Enjoy Your Ride and Help you Explore. 1000W MOTOR &48V 26Ah Dual Batteries? The electric bike both for adults and children is equipped with 48V 1000W powerful brushless motor, max speed up to 280mph easily.