battery overheating

After a quick flight today I noticed a little distortion in the plastic at the rear of battery compartment above the contacts (see picture). Upon further investigation I see a hole has been melted through a battery, but only one of the 3 batteries I own and rotate in my drone. Has anyone seen...

It's a crisp foggy day here in Idaho and I wanted to record the snow accumulation as well as do a Tap Flight. Lift off was normal, switched on Tripod Mode and then a slow rotation to record a 360 degree rotation. After that I ascended to above the trees and set up a Tap flight down the...