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I ordered EELbatteries from Alibaba, paid on August 25, 2021 and received them in Bulgaria in November 2021. These are 4 cells with a capacity of 305-308 Ampere hours. I loaded them separately and assembled them. I tested them and I am satisfied with the result.

And are there, are BMS produced for about 230 volts LifePo4 pack 72S?

You test them. Then it will be clear to you and to all who use this forum.

Please write about a schematic or structure of a slave/master system. Or connect 4 16S batteries in series?