It can happen to any Li-Ion batteries
here's an explanation, courtesy of How Stuff Works
http://computer.howstuffworks.com/dell-battery-fire.htm
elemental_drago
Hmm... I read the article, and from what I can tell the Lithium Ion battery does not necessary 'explode' per se, but rather, the metal sheeth (if that's what you want to call it) that surrounds the high-energy insides may move around if charged very, very frequently. They liken it to rice cooking in a pot, once the water begins to boil the rice may shift around. So what people need to panic about is whether their rice is holding firm within their battery pack!
I'm lead to believe that this case involved an older PSP Phat, seeing at it would have had more time for the rice to move around with more charges over what may have been several months to a year. In fact, seeing as the kid had it in his pocket, you can also assume that he was quite rough with it, which might have further encouraged the leak which caused the eventual fire. Coupled with the fact that he kept it in his pants (must've been baggy pants, no pants of mine would fit a PSP, that's for sure) caused it to overheat and spark.
Lesson of the day:
Don't be too rough on your lithium ion battery charged electronic device, keep it in a bag and not in your pocket, and don't overboil your rice, cuz it makes it all mushy.
There, scooby friends, this mystery has been solved. Either that, or Sony is trying to... TAKE OVER THE WORLD!
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