Abstract: A self-contained electrically powered and fully submersible swimming pool vacuum includes a vacuum head having a housing with an elongate vacuum mouth at a bottom end, a discharge opening at an opposite top end and a thrust channel extending therebetween. An electrically powered motor is supported within the thrust channel and drives a propeller to create a thrust through the housing from the vacuum mouth through the thrust channel and out from the discharge opening. A catch bag is removably secured to the top discharge opening for collecting debris sucked through the vacuum mouth. The vacuum includes an onboard power supply, a smart power switch for driving the motor at different speeds and for detecting and clearing motor jams, all contained within a watertight housing fixed to an outer side of the vacuum housing. In one embodiment, the onboard power supply is a lithium ion rechargeable battery.