sounds like the wrapper got rolled up a bit and stuck... try removing the top of the mod and pushing the battery out the top... nevermind... looks like the top doesnt come off ( just looked at some pics of one)
orrrr... the battery vented and swelled and its doomed... time for a new mod and battery..
I think he had a not so good battery that swelled too.
He may be able to push the battery out far enough to grab the battery snd pull it out.
I hate these stupid hybrids or faux hybrids.
If the Atty's 510 doesnt extend far enough or there is a squishy O ring where the collar around the 510 PIN touvhes the top of the battery you have a hard short where the battery does one of four things
1 gets very hot
2 vents
3 swells
4 goes BOOM.