The "power manager" system uses a "round robin" charging cycle that constantly evaluates the demand for power and concentrates on the devices that need it most. The system inherently senses when batteries are nearing a full charge and automatically reduces power as required. The "power manager" not only prevents circuit tripping, but also allows each set of device batteries to cool down between charging cycles, thereby extending their life. Locking slots in the front of the cart position the cords so they can be easily plugged into the device. And the back of the cart features the first removable cord management system.