I have a number of salvaged 18650s and 21700s (Tesla Mod 3). I know the chemistries are a bit different and the cell capacities are different (I assume ATM 5ah for the 21700s and 2.6ah for the 18650s). I'm thinking of building a 48V 14s battery using strings of each. For instance 4x10 21700s in parallel for ~200ah and 4x19 18650s in parallel for ~198ah or 4x20 for ~ 208ah. It seems I should be able to use these packs in series as they have the same voltage and close to the same capacity. I think a 14s BMS should not have a problem managing such a setup. Is there a reason to not do this? By extension, it seems I should be able to increase the bank's capacity by adding 4x5 21700 packs in parallel to the 21700 strings and 4x10 18650 packs in parallel with the 18650 strings. Of course each string would get a ~100ah increase at the same time. Thoughts?