MacBook Pro Battery "explosion"

I pulled out my MacBook Pro from its backpack after a good month sitting unused under my desk.  The battery had "exploded" - and by that I mean that the casing had expanded, broken the seal and was coming apart.  When I removed it from the bottom of the MacBook, it was impossible to put it back.
A) Any idea what caused this?  Its been sitting in a backpack, inside, under my desk.  No extreme temperature changes or anything.   I don't use it as often as I used to, my prime traveling computer is my ipad.   A month ago it was fine.  Now this.
B) Is it safe to use the MacBook just plugging it in, with no battery installed?
C) The MacBook is a few years old - but is this kind of thing covered by warranty?
Any thoughts would be appreciated. 

Only problem of running the Mac without a battery is that any power interruption will result in data loss, since the system will crash & die immediately.
New batteries can be had in many places, like PowerbookMedic.com or IFixIt.com. Just have your model # handy so you can locate the correct replacement. While you're at it, check and make sure the trackpad did not get bent and damaged by the expanding battery, a known side effect of that problem.

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