Modification of a charging adapter for round cells

That is how it began. I wanted to modify the charging adapter from a common negative to a separate negative for each bay to charge single batteries independently.

To do that, I had to open it and figure out how everything is connected.

Now I had to make an additional circuit board to carry the additional connectors. I usually use KiCad.

Here the two boards.

A little bit of mechanical work and we are almost done.

Here the modified product.