The performance boost is achieved by reducing something called voltage SAG.
Voltage SAG occurs when you suddenly draw a lot of power from the battery. For example, if you are at a junction and need to accelerate quickly, your voltage might go from 54v to 48v. That’s a drop of 6 volts.
This phenomenon is known as voltage SAG. If we can reduce voltage SAG then we can increase speed, power, and performance.
Higher voltage = higher speed
Higher current/amps = higher torque (acceleration)
Higher power (voltage x current/amps) = higher force to ride you and all the weight you have with you, including the eBike itself.
If you are using one battery and you notice a voltage drop of say 6 volts, then with 2 batteries that will halve to 3 volts and with three batteries that reduces further to 2v.
Let’s assume you are using fully charged 48v batteries. Fully charged these should register around 54.5v.
One battery – 6v SAG
54.5v – 5v = 48.5v
48.5v x 30 amps = 1,455 watts
Two batteries – 3v SAG per battery
54.5v – 3v = 51.5v
51.5v x 30 amps = 1,545 watts
A performance boost of 90 watts compared to one battery
Three batteries – 2v SAG per battery
54.5v – 2v = 52.5v
52.5v x 30 amps = 1,575 watts
A performance boost of 120 watts compared to one battery
Since the voltage SAG drops, all that extra voltage will give you more power, torque, and speed.
Note: The voltage SAG depends on the C rate of the cells. Some are 10C, 15C, 20C, and so on. Where C = the capacity of the cell. So when they discharge instantly, they can supply xC Amps instant current.