A good quality, decent capacity lithium-ion battery is often the most practical option, since it will give you the best performance, reliability and longevity. There are many claims for different lithium-ion e-bike batteries, with cobalt, manganese, and more. No worries! There doesn't seem to be any consensus among experts as to which of these formulas is better, so for now it's more important to get a well-made, high-quality lithium-ion battery. In practice, this means batteries with cells (cells are the individual components of batteries) from reliable manufacturers such as Sony, Panasonic, and Samsung.
It is also crucial to buy an e-bike with a high quality electric drive system to ensure the batteries are constructed to high standards. Some well-known drive system manufacturers are Bosch, Brose, Shimano, and Yamaha.