There is a gel inside the batteries that may be frozen or too thick from the cold to allow the power to flow properly. Bring the scooter inside and allow it to gradually warm up to see if that will allow the current to flow from the batteries. Do not attach the charger until the batteries have thawed a bit as this may cause damage to the cells. If the controller warms up too fast, condensation may build up inside it which can damage the electronics. Slow and steady wins the race.
Good luck!
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