I was talking to a mate tonight and he mentioned he had an older Aldi
/ Ctek clone type charger where the button had stopped working (so he
couldn't even put in into 12V mode). ;-(

Is it very likely it's just a small pushbutton SM switch (I seem to
remember reading here people had replaced said on theirs ... Dave P?)
and are they typically the same thing (size / spec) across most
models?

eg, If I get one (10) on order, what should it be or should I wait
till I get it and order from there?

I have a fair few bits of old kit that has the little square momentary
switches that the switches would be unused (or never carried any real
current) that I could probably desolder if it wasn't that critical?

I'm assuming a single pole, push to make / momentary?

Cheers, T i m