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Thanks again for both of your thoughtful responses! I think I'll move ahead with both your suggestions: 1. Try to run the battery through a few cycles monitoring closely with my volt meter to make sure I don't fry cell 2.1. 2. Push to get Daly to replace the BMS. From reading the forum it...

This just in from Daly customer support. Should I believe them?

@snoobler Yes, BMS1 works perfectly on battery2 (also using the balancing leads from battery 2). For cells 2-4 my measurements match what I see on the BMS down to the 2nd digit. e.g. 3.34xV where x means the measurement was different. My volt meter measurement of cell 1 also matched the...

Thanks for your replies @snoobler and @Pete7! I'm attaching a quick diagram of the system. I hope that clears things up. And to @Pete7 's point, it's a brand new install with clean contacts. I even swapped out the ring connectors of cell 2.1 just to be 110% sure. It didn't make any difference...

I just built my first LifePo system following Will's youtube videos and buying from his links. I have two 12V 270Ah banks in parallel with two 250Ah Daly BMS's on each bank. One of the BMS's works perfectly. The other shows the first cell voltage 0.1V lower (see screen shot below) than the other...