Thanks Max. The FX-85v is not included in the list

I have gone through the kids garbage dump (2 drawers full of school and college leftovers) and found a scientific calculator. It will serve me OK. I had to replace its AAA battery. Again, that reminded me of the FX-85v , which was dual power. It has a solar cell and I used it for decades without the need to replace its dead battery.

That calculator sounds like too good to be true
But it's true.