About ebike batteries. They’re most often measured by nominal voltage. Nominal voltage is just a fancy way of saying the average voltage. This is because each cell inside a battery can hold a specific range of volts.
Most Lithium-Ion batteries (Li-Ion) will have 18650 cells inside. But BtrPower battery is soft polymer pack. it's more stable and safer than 18650 cells. Li-ion battery cells hold 4.2V when fully charged and 3.0V when discharged.
48V batteries generally have 13 cell clusters.
Most ebike motors will accept either 36 or 48 volts. These are the two most common nominal voltages. so take about the 48v battery.
Each cell cluster has a nominal voltage of 3.7V. So we can calculate 3.7V * 13 cells = 48.1V or 48V nominal.
When fully charged however, this “48V” nominal battery will actually hold 4.2V * 13 cells = 54.6V.
But btrpower 48v li-ion battery pack have 14 cell clusters.so its voltage is 4.2v * 14 cells =58.8V
As you discharge the battery, it will drop each cell from 4.2V down to 3.0V – a minimum voltage of 3.0V * 14 = 42V. it means that its cuf-off voltage is 42V.
Now Let's take abou the LiFePO4 battery.LiFePO3 battery cells hold 3.65V when fully charged and 2.5V when discharged. We also take 48v battery. as an example
48v LiFePO4 battery pack have 16 cell clusters. When fully charged, this “48V” nominal battery will actually hold 3.65V * 16 cells = 58.4V.
As you discharge the battery, it will drop each cell from 3.65V down to 2.5V – a minimum voltage of 2.5V * 14 = 40V. it means that its cuf-off voltage is 40V.
Volts translate into speed on your ebike. If you juice up your ride with more volts (but still within the operating limits of your motor!!) then you’ll reach a higher top speed. Assuming everything else stays constant.