Basically if you leave Alkaline batteries in the device for a long time (years) without using them they will loose all charge and there is a chance of them leaking.
Leakage is significantly more common with the Zinc-Carbon batteries (the tech in use for most batteries in that format before Alkaline) though those leak something that forms blueish crystals.
I once saw old D cells inside the toy train my father had as a kid. They basically looked like they liquefied and then re-solidified in the basic shape of a D cell.
Yes.
Basically if you leave Alkaline batteries in the device for a long time (years) without using them they will loose all charge and there is a chance of them leaking.
Leakage is significantly more common with the Zinc-Carbon batteries (the tech in use for most batteries in that format before Alkaline) though those leak something that forms blueish crystals.
I once saw old D cells inside the toy train my father had as a kid. They basically looked like they liquefied and then re-solidified in the basic shape of a D cell.