There is often a trade off in life, one thing for another. Eg. The more organic you want your broccoli, the less money you’ll have to spend on beer. The more beer you drink, the worse you’ll feel in the morning. Well, the trade off in electric biking is the faster you go, the less distance you can cover. If you stick your head out of a car that’s not moving you don’t feel any wind. If you stick it out the window at 100km/h then it’ll blow your ears off. That increase in air friction is essentially the drag that you have to overcome with either pedalling or electric motor. The faster you go, the more friction there is and hence your distance will be less. It’s not a linear relationship either, which is what creates a problem for people wanting to travel long distances at higher speeds. A customer needed to travel the 35km he was commuting daily but wanted to do it at 35km/h and not 25k/h so opted for a 500W motor. He could manage this distance with an 11.6Ah 36V Panasonic tube battery but when his need increased to travel 70km he had to get more battery power. We did this by getting another 11.6Ah tube battery and running them in parallel. Doing this is very simple, you take the red leads from the battery and crimp them together and do the same to the black ones. Then connect this to the controller. You can control which battery you use by the switches on the bottoms of the batteries. Running them both together gives you a slightly greater speed. All worked well and he’s a happy customer covering a lot of ground through the week.