I’m an electronics engineer student based in east Germany and building custom liion battery packs in my spare time.
I use all the good stuff like quality cells from nkon.nl , pure nickel strips, insulator rings, fishpaper between the series cell groups and so on.
I’ve built a few battery’s so far, you can see the pictures below. (Meepo 10S2P upgrade pack with 20700 cells and 30A bms)
I can pretty much build any battery pack you want in solid or even flexible packs.
Prices will be fair and individually based on the pack you order.