Frog design, safe and reliable, faster acceleration, full power, life expectancy is stronger than the ordinary; Light weight, more economical to use, can be carried home at any time to charge, even if the high-rise also do not have to worry about stolen batteries and charging inconvenient; Frog lithium battery 3-5 years do not need to replace the ordinary lead-acid battery 1.5 years after the use of the battery needs to be replaced, and the battery in the cycle after 1200 times, the capacity retention rate of 70%, slow attenuation, longer service life.