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So you're saying the the other pads are affected by the 3.3V pad and this is why the others are also disintegrating?
yes, the SWDIO having 3.3V due to internal pull up causes current to flow when you sweat causing electrolysis
as for the rest I don't know, I'd guess there is no PCB there but copper rod going through but I did not have the watch opened so I don't know, I wouldn't risk with solder as long as it still works, it could make it worse
fanoush
@devsnd
Thanks @fanoush, I had sticky tape on the middles ones, but the tape keeps disappearing.
So you're saying the the other pads are affected by the 3.3V pad and this is why the others are also disintegrating?
Maybe it's not clear on the photo, but the brownish part on the outer pads is actually the color of the PCB, meaning that the pads are almost gone. Could I add a tiny drop of solder there? Would that allow me to charge still?