The 250 watt vacuum motor with run time of 45 minutes ensures there is plenty of power and operational capacity. The 36 volt lithium ion battery can be interchanged with our canister units and charges in 2.5 hours. Its patented ribs on the inside of the tank ensure no matter how full the bag is we don't lost suction since the bag is never allowed to seal against the side of the tank cutting of the flow of air. This is critical on battery powered equipment since we don't have the luxury of high powered electric vacuum motors to pull the dirt through the bag.