Range is a key consideration with e-bikes, and is affected by factors such as motor efficiency, battery capacity, efficiency of the driving electronics, aerodynamics, hills and weight of the bike and rider. These days, awesome ebike battery packs constructed of quality 18650 cells are available to average bike builders thanks to advances in 18650 DIY pack building methods.

The battery pack is probably the most expensive component of your ebike, so its best you understand what you are paying for before making a big battery or ebike purchase.