On the road, the Chevrolet Volt offers spirited driving performance in a remarkably quiet interior. More than 220 lithium-ion cells contained within the Volt's battery pack provide ample power. The Volt's electric drive unit delivers the equivalent of 150 hp/110 kW, 370 Nm of instant torque, and a top speed of 161 km/h. The lack of engine noise, combined with special sound-deadening materials, makes the Chevrolet Volt an extremely quiet vehicle to drive.