This is what I'm say'n. Packs that start to puff in storage after use are dangerous. I had one start to balloon up in a hard case, and if in the course of ballooning up, it punctures itself on say a solder joint, bam -- fire. This pack was fine when I put it in storage in my ammo box... it had sat for weeks before starting to puff and stink, all while voltage was perfectly fine for storage. I'm guessing it became compromised during a race in my 1/8 electric as it was releasing all sorts of nasty smells as it puffed, which means one of the cells was punctured, and of course, a punctured cell is a time bomb waiting to go off.

Let us not forget that laptops and cell phones DO go off like road flares too, but these devices tend to not be involved in the constant abuse of model racing so they tend to not be compromised nearly as often or easily. Lipo's in RC go off because we abuse the heck out of them compared to other applications. I mean passenger cars rarely have their fuel tanks burst into flames, but you still have to wear a fire suit when racing full size cars because they do, and the chances are greater -- far greater -- when racing.

http://computer.howstuffworks.com/dell-battery-fire.htm