4s 32700 LFP LiFePo4 12.8v battery case

This is a 4s LFP (LiFePo4) cell holder, to make a 12.8v (nominal) battery, from inexpensive 32700 cylindrical cells.

THIS MODEL IS STILL A WORK IN PROGRESS - I'm working on a better end cap, but for now it's just a hole to let a XT60 and some wires out.

The cells are currently (early 2026) very cheap on sites like AliExpress. I bought B grade cells and mine came out about 5Ah, which is not bad for the price and size