An *assumingly* expensive haul!

I always try to remove batteries when I store them, too many horror stories with old cheaper batteries

Absolutely this is the case with me too, but if i'm gonna store them for long periods of time, i put aluminum foil in between the battery and both terminals, so if corrosion were to occur, it would go to the foil, rather than the terminal. Like a barrier almost. Maybe one of these days i should put up a tutorial on how to fix the corrosion on the terminals.