Battery World is a chain so might be in other states... but that's where I drop off all my dead batteries (I put them in a double plastic bags and drop them off every few years, along with other batteries like camera, phone and computer).


On topic, I'm not sure how I missed them, but tonight I found (button cell) batteries in one of my "Armada" Unicrons... and they had both leaked. Hopefully they didn't corrode the electronics too much.