You should be able to understand the technical terms used to make informed decisions when buying batteries for your electric bike.
Watt-hours, or Wh for short, is one term that might come up. When calculating how much battery capacity is required to travel a given distance, Watt Hours is an important measurement. It is the energy contained in a battery pack. You can also search for S-Pedelec, 45Km/h e-bikes, and buy the fast e-bikes at Speed-e now.
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This is done by multiplying the Ah or amp-hour of a battery pack with the total voltage. Both 36-volt 20Ah and 72-volt 10Ah packs have 720 watt-hours. They should be able to travel the same distance if you ride at the same speed.
The 72v pack can be used to accelerate faster and reach a higher speed than the 36v pack. You can take advantage of this and ride faster, but you'll encounter wind resistance that will require more power. You will travel less distance before the battery runs out, but you'll reach your destination quicker.
A Crystalyte 5304 hub motor with a 24-inch wheel and a motor controller set at 90 amps will give you an average of 35 to 45 watts per km (58 to 75 watts per mile). This is at a speed of 65KPH (40 MPH) with no pedaling.
Your power consumption will be affected by how fast you accelerate and what your top speed is. Your terrain and weight will also impact your power consumption. If you ride very slowly on flat terrain (using the same setup as above), or if your speed is high up, you can use less than 25 W/KM.