I am stuck trying to get these batteries I built to work. I have built two successful batteries before using a spot welder from ebay and boards from batteryspace, but the current two keep behaving weird and are unusable.
I bought 100 18650 ncrb batteries from r-lsales on ebay. After following my schematic, I keep getting the same two series failing which then is making the whole battery not accept a charge. I proceeded to remove those and add a fresh series. This then also died.
This is happening on two separate batteries with two separate boards. I then purchased a discharge tester https://www.amazon.com/gp/product/B01EV ... UTF8&psc=1
and charged and discharged a series before again inserting. Again, there seems to be a slow drain on the same exact series.
So... Maybe the schematic I am using is creating some sort of drain? It seems that my initial conclusion that some cells were dead on arrival isn't correct anymore. Any ideas would really be helpful as I am not an electrical engineer.
I am sure there may be some more info that is needed, so please ask away...