This thread made me go get my old VOM out of the drawer to look at it because I didn't even remember what make it was. I still use it now and then to check the voltage on my golf cart batteries and to check capacitors, especially when my Harbor Freight VOMs break.
I just realized that I bought it used in 1970 when I started my air conditioning business and I have never changed the battery and it is still good. I never even opened it up so I don't know what kind of battery is in it. Now my curiosity is up and I will have to open it when I get a chance to see what type of battery could have lasted for about 50 years.
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