Remove the battery from the box and turn the switch to the ON position. The LEDs on the battery should light up to indicate that the battery is functional and that there is an appreciable amount of charge in the battery. Install the battery by first seating it at the base at an angle and then gently push it into a vertical position. You need to insert and turn the key anti-clockwise to lodge battery snugly into the top bracket. You should also see the change level indicator at the handlebar will also light up. Remove the key, make sure the battery is in position and not movable. Turn OFF the battery. (less info)