SRK’s positive contact is opposite driver PCB. it can very easily wear out and once it damaged, may be beyond repair.
here simple mod for that. I put round PCB and solder middle point. now stock driver board is protected. And now batteries tightly hold and I tested with flat top batteries too.
this mod is simple
1. cut single/double side PCB (round cut… this is the hard part without proper tools)
2. drill 5mm hole in middle of PCB
3. center PCB on driver board and fill solder to contact copper area of PCB with driver positive plate.
clean both contacts well before soldering. I used double side 1mm FR4 PCB.
That's a big magnet. This would work, but the drawback of using magnet is of course, you have to be extra careful that it doesn't slip and contact the body. Last thing you want is 30Amp running unhindered, through your li-ions, in a sealed container.
This would also eliminate the problem of the wear of another PCB, with only thin conductive layer.
Also, maybe use copper foil instead? (the adhesive type, I guess) It’s much thinner so less problem with the batteries, and maybe even no need to solder anything, easily replaceable.
Is it electrically conductive from both sides? Doesn’t the glue act as insulator?
Finally got round to doing this,was really wanting copper discs but can only find them in quantitys of 10,I drilled the centre 8mm,wish i hadnt as my soldering iron struggled to fill the hole,had to use a solder gun .Thanks for sharing. Circle not as neat as yours but does the job!
