You must remove the two Phillips screws on the black plastic seat. Remove the seat. Unplug the 2 prong hard plastic connector that goes to the 6volt battery. Connect the charger directly to the 2 prong connector that goes to the battery. Wait 6 hrs and then unplug the charger. Reconnect the connector that goes to the motor back to the battery. Replace the seat and tighten the 2 screws down. Enjoy!