I've never seen a battery fail this way. The first pic is the view of an AA cell that was installed in a 2-AA LED Maglite flashlight. The metal of the negative terminal is so thin and soft that one of the negative terminals is now a convex contact and the the other is damaged by the spring battery contact at the bottom of the flashlight.
I initially thought the Maglite was bad. These batteries are junk and makes the flashlight act like it has an intermittent contact. Don't buy the batteries.