Tried first electroplating technics with copper sulfate but did not succeded unfortunatly. It looked promising though !

Second round and easy task - metal TAPING ! Prepare support for cleaning with isopropylic alcohol.

Make both sides.

And do nice corners ;)

Final touch with some polyamide tape to avoid short-circuits.

Do some painting with mixture of white paint and bicomponant epoxy resin. Tedious task because of the low viscosity... drop by drop... FUN PART

Finishing with some sanding job

Not so bad for PLA, looks mat with some 3d printed marks and gives it nice looking I think.

14 cells in serie/parallel => 2S7P configuration

custom support for each sides of battery to avoid soldering directly to the pods, easy change.

Following pictures are from my previous attempt, 1S14P pack. I forgot to shoot the new battery, sorry :)

Battery pack testing with the real 2S7P pack. Seems working fine, no fumes :)

RPi GPIO provides 3.3VDC so to drive 12VDC fan you should add some other components and use more common 5VDC compatible MOSFET.

I had a few lying around.

• NPN (2N3904)
• PNP (2N3906)
• MOSFET (IRF3704)

Forgive me for the PCB soldering quality... (JLCPCB was a long option, etching too dirty and my CNC is still under construction).

Put all together ! Tricky part because of little space between components

Credits : wallpaper from Lutetium Cyberdeck 2023 Gallery