Alright, all 8; 4 1st gen, 2 rotating-turret, Godzilla and Mecha-Godzilla are now appropriately prepared for long-term storage. Who knows, maybe in the near future battery technology will be much better.
I was pleasantly surprised to see there was absolutely no corrosion on any of them, matter of fact they all looked pretty much brand new on the inside. BIG relief there.
I actually only have 2 Tank sound cards. Finding anymore has proven absolutely fruitless. I'm fairly confident that unless you live in Japan and have a network of people going door-to-door, this stuff just can't be found.