Syntaur Doing It Right
I have an Ensoniq KS-32 keyboard that was released 20 years ago. I think that mine is only 17 years old, though (I'm the third owner, but I have owned it since 1998). Anyway, it's a great board, and it has treated me very well for a very long time. There had been a low battery warning for, probably the last 10 years or so. My response was to just never turn it off, which worked until I had to turn it off for a while....