Most electric bikes have batteries sizes between models. But the average battery of them is 10 Ah (Ampere Hour). If two electric bikes have exactly the same battery capacity, that does not mean that you get exactly the same range from both of them. There are other factors that go into determining the range of an electric bike. Like the size of the motor, your riding style, temperature, the slope of the terrain, etc. There is also an economical speed range in which you get the maximum mileage. The range decreases exponentially as you go above or below that.