A "scorch mark" indicates some arcing has occurred, which suggests a short could have occurred. You can never tell what damage has occurred
inside the battery. Like the saying, "You can't judge a book by its cover", you can't judge what inner damage a battery has sustained by its outer appearance.
I suggest keeping a close eye on those
batteries. Check the voltages coming out of the mod, and coming off of the charger. If the voltages are not kosher, I'd dispose of the batteries.
If I were you, I'd be trying to figure out why my batteries both have dents in them, and one has a scorch mark.
That's not normal and something is amiss.