I found a bag of CR2032 batteries in the battery drawer, so of course, I'm trying them in my VMUs. The problem is, none of them seem to be turning any of my VMUs on. How fresh do the batteries need to be? I tested them all with a multimeter and got pretty good readings on a few, but they don't work.
Once I do get the things to work, what are some of the fun or useful things to do with them? Any good VMU homebrew?