1. There is a problem with the battery connection wire. Generally, a connection wire on the battery may be loose, or the terminal of a certain battery may be corroded and loose.

2. The power line of the controller is in poor contact. Find the controller of the toy lantern with battery. Mainly check the thick red and black wires of the controller to see if these two wires are loose and fallen off. If so, then Just install it. If it still cannot be solved after installing it, then there is something wrong with the motor. Generally, incorrect contact of the carbon brushes of the motor will also cause the power to not flow, so you need to go to a specialized repair shop.