Abstract: A device is disclosed herein for providing AC power to a toy, flashlight, stationary device, or similar load normally powered by one or more disposable batteries. The device comprises a substitute cell adapted for insertion in the toy in place of the battery normally used. The substitute cell includes a cylindrical shell properly sized to replace the normal batteries with conductive terminals configured identically to the battery, a flexible electrical cable leading from the terminals to a power unit. The power unit comprises a power supply accepting household AC voltage and providing a DC output equal in voltage to that supplied by the batteries being replaced. In addition, this substitute shell can be opened and a charged lower sized battery can be inserted instead of using the power supply, if desired, e.g. use a C battery inserted in the device to replace a D battery. The device can accommodate a plurality of different types of battery sizes in a parallel or series arrangement.