A floating power supply (10, 10') for a body of water comprising: a flotation unit; a power supply circuit housed within the flotation unit, wherein the power supply circuit can provide power to a device, such as a swimming pool cleaning device, a lighting element or other devices requiring a power source, within the body of water while untethered to a power supply source external of the body of water, the power supply circuit having a rechargeable power supply; the flotation unit comprises: a housing having a sub-housing extending down from a bottom section of the housing; characterised in that the flotation unit further comprises: a cover positioned over the sub-housing forming a watertight seal; a flotation device formed around a perimeter of the housing; a tubular member extending down from the housing and in communication with an interior of the housing; and a securing device attaching the cover to the tubular member forming a watertight seal; the power supply circuit being positioned within the housing, the power supply circuit comprising: a control panel attached to the sub-housing; a controller coupled to the control panel and stored within the housing; and a portion of the power supply circuit coupled to the controller and stored with the housing, whereby the power supply circuit further comprises a waterproof outlet coupled to the rest of the power supply circuit and positioned on a side surface of the housing, wherein an output of the waterproof outlet is regulated. a flotation unit; a power supply circuit housed within the flotation unit, wherein the power supply circuit can provide power to a device, such as a swimming pool cleaning device, a lighting element or other devices requiring a power source, within the body of water while untethered to a power supply source external of the body of water, the power supply circuit having a rechargeable power supply; the flotation unit comprises: a housing having a sub-housing extending down from a bottom section of the housing; characterised in that the flotation unit further comprises: a cover positioned over the sub-housing forming a watertight seal; a flotation device formed around a perimeter of the housing; a tubular member extending down from the housing and in communication with an interior of the housing; and a securing device attaching the cover to the tubular member forming a watertight seal; the power supply circuit being positioned within the housing, the power supply circuit comprising: a control panel attached to the sub-housing; a controller coupled to the control panel and stored within the housing; and a portion of the power supply circuit coupled to the controller and stored with the housing, whereby the power supply circuit further comprises a waterproof outlet coupled to the rest of the power supply circuit and positioned on a side surface of the housing, wherein an output of the waterproof outlet is regulated. a cover positioned over the sub-housing forming a watertight seal; a flotation device formed around a perimeter of the housing; a tubular member extending down from the housing and in communication with an interior of the housing; and a securing device attaching the cover to the tubular member forming a watertight seal; the power supply circuit being positioned within the housing, the power supply circuit comprising: a control panel attached to the sub-housing; a controller coupled to the control panel and stored within the housing; and a portion of the power supply circuit coupled to the controller and stored with the housing, whereby the power supply circuit further comprises a waterproof outlet coupled to the rest of the power supply circuit and positioned on a side surface of the housing, wherein an output of the waterproof outlet is regulated. a control panel attached to the sub-housing; a controller coupled to the control panel and stored within the housing; and a portion of the power supply circuit coupled to the controller and stored with the housing, whereby the power supply circuit further comprises a waterproof outlet coupled to the rest of the power supply circuit and positioned on a side surface of the housing, wherein an output of the waterproof outlet is regulated.