What is the third centre battery terminal on fold and go mobility scooter?

The third centre battery terminal on a fold and go mobility scooter is typically used for charging the scooter's battery. It is usually labelled with a "+" or "-" sign, indicating whether it is the positive or negative terminal. When charging the scooter, the charger's positive terminal should be connected to the scooter's positive terminal, and the charger's negative terminal should be connected to the scooter's negative terminal. This ensures that the battery is charged correctly.