So thanks to @Sharing Society I got my hands on couple of fried BMS boards from EG4 Lifepower4 48v batteries. One of the mosfets labeled SVG104R0NS (120A 100V) got so hot it scorched the pcb. I desoldered it and amazingly this mosfet still works! Next I tried to power up the board but I could not figure out how to make it wake up. So I bruteforced it by applying 27V directly to input of dc-dc converter that feeds the micro controller. It woke up and did its LED light dance which ended with red fault LED staying on. I ordered USB to RS485 dongle to try to connect it to PC for further testing.
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