The 13s - 20s makes the BMS very flexable. As it is fully configurable, you could in future handle cells with other voltages than what is currently the in use (3.2V or 3.7V lithiums).
So with this BMS you can create a 48V battery from cells that run at 2.5V when such cells are intruduced.
And 13s will give you a 48V battery using 3.7V lithiums.
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