Battery has bloated. Is it "dangerous"?

Greetings,
Yesterday, I came back home and brought my MacBook Pro out of my bag. I noticed something strange: my battery had bloated (while I was walking to go back home, probably).
Can low temperatures (freeze) make batteries bloating? What else can be done this (especially yesterday where I didn't anything so special)?
Then, my uncle examined the battery (he's supposed to know better than me, but I'm not sure). He said I just had to stick* the sides and there would be no further problems. The button (5 lights indicator) is still working perfectly (I haven't put the battery back since I noticed the problem).
Is he right in saying I can continue to use my bloated battery? (I'd prefer "yes", as a new battery isn't cheap). I'm currently afraid of the battery exploding (I have heard it could).
*I'm not sure of the correct word (sorry for my english that lacks words).

You need a new battery now. Although the danger of the case "exploding" are low, the swelling puts pressure on various case components and can permanently damage the computer. The first things to go are the trackpad and keyboard functions. Also a swollen battery can quickly become a leaking battery and the electrolytic chemicals inside will do fatal damage to your computer.
The best action is to remove the battery and take it to an Apple Store. Sometimes they treat a swollen battery as defective and replace it without charge. Depends entirely on the store, so they may tell you you have to buy. Nevertheless, it's worth investigating. In short, one way or teh other, you have to repalce this battery.
Info on temperature is here:
http://www.apple.com/batteries/notebooks.html
Reference to the "running without a battery" issue here: http://support.apple.com/kb/HT2332. The article does not say how much the processor slows, but knowledgeable people here say it's either one-half original processor speed or 1 gHz.

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