On my 286 board, the CMOS battery is missing – as with most boards of that age. I see no other battery connector on the board. However I would love to fit a battery in there, so that I do not have to enter all the settings every time. What options are there? I guess I can't just solder any battery holder in there, since the original battery was probably a NiCd rechargeable. So what are my options? Are there 2032 button cell holders with charge protection or something like that?
Also there is still a bit of corrosion on the traces as you can see. What do I best use for neutralizing it? A bit of vinegar?