Now, that is something new, but the fact that a phone battery can hurt you is not new. Do NOT ever, under any circumstances breck the battery apart. Since it has compounds of lithium in it and since lithium is very reactive with air, the batter will start burning and will explode.
The energy stored in a battery is the same as the one from 40 .44 Magnum bullets. The word says that such a bullet can rip you head off, but closer to the truth would be that it will rip a part of you head off. The same with the battery: it can burn and hurt you if you are not careful enough. Also, try not to speak at the phone while the phone is charging.