Hi All,
I have a HP-41CV calculator over 20 years old. I made the mistake at some point of putting some cheap Radio Shack batteries in it - and one of the battery terminals suffered somewhat minor damage. I attempted to gently clean the terminal with some baking Soda mixed with just a little water and to gently dry and buff the area to remove the green crud. However, I could not get it completely clean and I hesitate to clean more vigorously as it looks like the metal is starting to separate just a little.
When I replaced the batteries with new ones 0.0000 appears briefly and then fades out. I took the batteries out and put them back in a couple of times and now it appears to be working fine. But I suspect that the battery is not making perfect contact with one of the terminals. Incidentally, the other three terminals look shiny/new and are in perfect condition.
Is there are very minor repair that I could do to the 1 slightly damaged battery terminal?
Thanks,
Kevin