Lipos getting hot

[Klausen]

I have 2 x 7,4v. Maxamps 6000 mah. lipos

I have never really driven them out to their full potential, and I have never been near the cutoff point.

Then today I ran them in my Brushless E-revo, for around 15 minutes mixed driving, with some speedruns too. After I stopped they were really hot ( It was possible to hold them in my hand though), but they were kind of like "floating" and a bit blowed up.

My E-revo have the MMM set-up, and the esc´s fan wasn´t even activated.

Do you know what have happened, and are my lipos ruined?