Where to buy a suitable controller - EBiCS/EBiCS_Firmware GitHub Wiki
6 FET aluminium case from Aliexpress
12 FET New Generation aluminium case from Aliexpress (now potted based on a review but see 1(https://endless-sphere.com/sphere/threads/lishui-open-source-firmware-project-kingmeter-5s.106862/post-1770466))
6 FET battery case integrated as NCM spare part
Sometimes cheap offers, search for the "F" :-)
Self made EBiCS compatible controller of arozhkov2001:
Discussion @ES
BOM + Gerber