I was considering making my own pack but then came across this 1s4p.
Going for a 12s4p set up and thought this would make everything much easier if I just bought 12 of these things and connected them to create 12s. No need to make packs and super easy to replace old batteries with new ones. The battery compartment under the board will be made out of silicone with squares in it for each 1s4p pack.
Although another version without the PCM can also be bought. I just need to hear back from the folks on here about potential issues and whether PCM or no PCM is preferable.
I’m thinking this is no good or else people would be posting these in their “build threads” of which I’m yet to see.