eMap will not turn on unless I remove batteries and put them back in
I just bought a used eMap to (hopefully) replace my old one bought in about 2001 which no longer turns on. The one I just acquired turned on fine when I put batteries in it after receiving it. However, I turned if off and when I went to turn it back on a few minutes later, nothing happened. I removed the batteries, put them back in - and it turned on just fine. Same thing happened again when I turned it off. Any ideas about whether there's anything to do to this old device to try to get it to be able to turn on without removing and replacing the batteries every time.