Required to replace a dead battery charger (it has been charged intermittently and drained the battery to preserve battery life), but the manufacturer charges 3 times the price of this charger and is only available in China. It was 7-10 business days (3 weeks). They also said that nothing else in the US charges scooter batteries BECAUSE of different weird voltages. Well it works but it gets SUPER hot so 4 stars not 5