From 2005 onwards, this was a period of rapid development for China's electric bicycles, known as the "spurt phase" by the industry. During this period, the fierce competition between companies greatly stimulated technological progress and the proliferation of new technologies, resulting in a significant increase in the level of technology across the industry, with battery life and capacity increasing by 35%, and motors developing from single brush and gear motors to brushless high-efficiency motors as the mainstream, increasing life by 5 times, efficiency by nearly 30%, and climbing and load capacity by about 3.5 times. In the performance improvement at the same time, the manufacturing cost also dropped significantly, the price power down to the original 21%; in the controller system and charging system, the technology level also improved significantly. In particular, there has been great progress in battery technology and motor technology, and the breakthrough in technology for lead-acid batteries for electric vehicles has led the international