This series of products adopt a large number of new materials, new technologies and new processes, with a higher weight ratio of energy and good vibration resistance, good product consistency, high charging acceptance efficiency, excellent recovery performance of deep discharge, low self-discharge rate, fully sealed maintenance free. The power supply system is very suitable for electric road vehicles. It can be widely used in low-speed electric vehicles, golf carts, tourism cars, elderly scooters, electric wheelchairs, electric sanitation vehicles etc.