Which model are you? Let's take the early education machine x 1s as an example: there is a screw on the back cover of the battery of the machine. You need to unscrew the screw with a screwdriver, and then pull the black iron wire cloth to eject the battery. Just install the battery according to the positive and negative poles of the battery tank, then cover the battery cover and screw on the screws to prevent the battery cover from being opened and lost by children.