It’s a sorry sight. Bad luck on that one. The A500+ is a rare beast. :-o
It’s hard to tell from the 1 good pic the extent of the damage. I guess there are tracks eroded away and looking at the pic there are 7 tracks in close proximity on the MB surface in the damaged area so it would be a doozie to repair. But not impossibly with a good rig and an experienced tech. (If the surface tracks are the only damage!!)
I think the A500 is only a surface and solder side MB. I’m sure someone will correct me if I am wrong.
You might be able to sell it off to someone willing to attempt a repair or as a parts spare for someone with an A500+. Because of the rarity it might get a good price even with the battery damage.
If you want to sell the working bits you might get something for them too.
You might expect to get $5-$15US for some of the key components.
Working Keyboard (If not yellowed)$10
8375 Agnus $10
680000 CPU $5
PWR Supply $10
CIAs, Paula, Denise, and Gary $15
Working A500 Floppy $10
These are just conservative guesses from what I have seen on ebay.
Who knows what the case is worth for someone with an A500+ scratched or broken case they might be willing to pay a bit. I guess it’s probably best to try and sell it as a spare damaged unit.
Gertsy.