There may be the following reasons:
(1) The battery enters sleep mode. When the battery level is lower than 20% and has not been powered on or charged for 10 consecutive days, the battery will enter sleep mode. In such a situation, your scooter will not start. Please connect the charger and charge for 3 seconds to activate the battery.
(2) The battery is seriously over-discharged or caused by other faults and needs to be reported for repair.