So, the original pack I built, was a nightmare. I made an oval PVC tube that fit to the front bicycle tube. Obviously, it was all over the place, to create series packs. With some continuing across a fair distance. I built it all with hot glue, and when finished, built a frame to strengthen. Then inserted it into the PVC tube. Lucky just to get 65 cells in there, I couldn’t fit a bms.
All this to say, a 48v 5 par pack with wildly different resistances throughout, gave me these numbers, when I dismantled the pack. About ten dead. One that the cell read 9.75v, huh? The rest, varied between 3.8 and 4.1. After 2 years of charging and using. Then being left in the elements for months. Now perhaps I charged to 80%, and so I didn’t go out far enough to create a bomb. And didn’t drop lower than 35ish percent charge.
So, not using a bms of any kind, they stayed between 3.8 and 4.1 . These were GA cells. This might have been fine, but I was always worried that they were too far apart. And that they would blow up when on charger.
So, I guess the moral of the story is, kids don’t try this at home. Anyway, an interesting experiment.