The NCM and ET.Cycle Battery range is influenced by several factors, including battery capacity and motor efficiency. The battery management system (BMS) also plays a decisive role. Attention: With the same battery capacity, but different motors, the range can vary considerably. As so often, it depends on the individual case.
Other factors that influence the battery life basically all have to do with how hard you’re having the motor work. If it’s having to overcome a strong headwind and lots of punchy climbs to keep up it’s speed, that’s going to require it to use more juice at a faster rate. Rider weight and cargo load also play a role, so if you’re loaded down with groceries or a big backpack, that will require extra work for the motor as well.
In addition to considering factors like weight, wind, elevation, and acceleration, you can increase battery range with good bike maintenance and tire choice. Fully-inflated tires and a clean drivetrain will mean less resistance for the motor, as will a smoother tire, as opposed to a knobby, grippy one.