6. 1990s: The first mass-produced e-bikes emerged in Japan and China, using lead-acid batteries and basic motor controllers.
7. 2000s: Advances in lithium-ion (Li-ion) batteries, brushless motors, and sophisticated control systems transformed the e-bike industry.
8. Present day: E-bikes continue to evolve with innovative technologies, designs, and features, making them an increasingly popular mode of transportation worldwide.