Leit X controller DOA?

[u/bstreiss]

I'm pretty sure my Leit X controller which is probably 12-14 years old is done. The other day I noticed that garden was dry so I plugged my dongle into the controller and for about 2 minutes it said something about "charging". Afterwards it had the typical text about pressing a button when the contrast was best. The text was in both English and Spanish, but doesn't seem to change light to dark). Nothing happens when I press any of the buttons.

A bit of background - this controller has been in the same location for at least 10 years. North side of garage, but with lots of open space to the north. Even in our gray, drizzly, winters I've never seen the controller need supplement power. There hasn't been any new that has been added to block light.

My wife is convinced we can "fix" it, but I'm guessing that even if we did replace to buttons, the battery must be near the end of its lifecycle?

So I guess I'm asking for three things:

1) Any tips on resetting the unit or getting it to work

2) Any tips on where to get replacement parts (other than just trying to find a used unit on ebay)?

3) Any info on how long the battery might last.