Hey there, I had a launch switch that I had let sit for about a year before touching again. It worked just fine when I stored it, but when I went to charge it to take it with me on a flight, it wouldn't charge, and would not turn on while plugged in.
I'm not sure if it's as simple as needing a new battery, or if not turning on while plugged in means it's worse than the battery, but I would love if somebody has any idea what could possibly be wrong with it.
I'm not against opening it up and fixing it that way if that's what's necessary.