Nice work Fechter. I still love my 2012 Metro. I got an empty auxiliary battery case and built my own 11S8P battery pack into it a few years ago. My potted frame controller doesn't like more than 50V, so 11S is the max I can feed it. It's working fairly well. Eventually the original frame battery crapped out on me. I finally conquered the hairball and and rebuilt it with LG MJ1 cells.
Somewhere along the way I seem to have killed the BMS. There is a short on the BMS output terminals. I don't have enough electronics knowledge to figure out the defective part and switch it out.
Any idea where to get a replacement BMS?
Since the MJ1 cells have 10A max discharge current I am thinking of using a Grin Phaserunner controller and hopefully fit it inside the frame.
I would still want to limit the max current to 35 or 40 amp. (That's 6.66 A per cell for the frame pack). Does anyone have experience with this kind of setup?