Only takes a couple of dodgy cells to cripple a packs performance.
If its made with chinese cells, then these can often vary quite a bit in performance with some performing quite well and others just not coping with high current draw at all. This is one of the biggest difference between chinese cells and those from the big 4, the cell to cell performance difference of a given SKU.
If your pack has a parallel group with a one or two saggy cells it can make the whole pack under perform, and might even be dangerous.
If its made with chinese cells, then these can often vary quite a bit in performance with some performing quite well and others just not coping with high current draw at all. This is one of the biggest difference between chinese cells and those from the big 4, the cell to cell performance difference of a given SKU.
If your pack has a parallel group with a one or two saggy cells it can make the whole pack under perform, and might even be dangerous.