Chemistry determines the cell voltage (1.2V or 1.5V and there are others like Lithium at 3.0V), whether the battery is rechargeable, and how the voltage changes as the battery discharges i.e. at what voltage is the battery considered to be flat or fully charged. Switched mode power supplies. One more point.
The Average Bike Riding Speed. The average road bike speed is between 11 and 12 mph. Bike riding speeds vary widely depending on your riding conditions. When you are zooming down a paved hill, your speed may increase to over 20 mph, while you may slow to only a few miles per hour when you are climbing a steep or rocky grade.
Seventy to 100 revolutions per minute is an ideal cadence for most cyclists. Riding a bike over short distances is simple and relaxing, but when you start putting many miles under your wheels or climbing steep hills it can be a tough workout. Maintaining an ideal pedaling speed helps to counteract the rigors of a long ride on your body. Cyclists refer to their pedaling speed as cadence.