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I currently have a 48v system with Catl 310ah cells. I want to upgrade(double) my battery and am looking at purchasing 16x Catl 301ah cells. (needs to match my existing cells) My system is 2+ years old and i am looking through this forum for reliable names/company to source from via Alibaba. I...

I had bought a cheap 4s BMS long time bank. I decided to test and see if works. I have connected all leads accept for the second battery. the first pic is battery voltage and the second is from BMS. as the second cell is not connected the BMS should not have any output right, or am i not testing...