Lead-acid (SLA)
Lead-acid batteries are affordable and are easy to recycle, however, they need to be maintained and may not last as long as other options. If you will be using your e-bike for a long commute, then this is not the right fit for your needs. Lead-acid batteries use affordable raw materials and are much heavier than other options.
Nickel-cadmium (NiCd)
Nickel-cadmium (NiCd) electric bike batteries have more capacity than SLA batteries, but can be expensive and difficult to recycle. While they last longer than SLA batteries, they are much more costly and, because you cannot recycle them easily, they are not as popular with those who want to be more eco-friendly with their commutes.
Nickel-metal Hydride (NiMh)
NiMH batteries are slightly more efficient than NiCD batteries and they also offer more capacity, safety, and reliability. You will also find that they are more environmentally friendly and easier to recycle. These batteries, while popular, are slowly being phased out by lithium-ion batteries.
Lithium-ion (Li-ion)
Lithium-ion batteries are ideal for use in high capacity, low power applications, such as electric bikes. They can be molded into different shapes and can fit into different devices and extra spaces. Due to their high rate of charge/discharge, they also provide a higher level of power.
Lithium-ion Polymer (LiPo)
LiPo batteries have become the go-to for electric bike batteries. They are easily rechargeable, inexpensive, and easier to discharge at a higher C-rate. Many e-bike enthusiasts choose both the Li-ion and LiPo batteries as their ideal solution to power and ease of use.