Is this something they they put in so they can tell if it's been tampered with inside... because people pull batteries out all the time... What is that thing???

HAHAHAHAHA!! Surely this is *eia

Adding video to channels (Eia) - requested by PlayhousePals.

The damage to the battery probably caused a short circuit, leading to thermal runaway. Li-ion batteries have a vent to avoid explosion risk, which seems to have turned this particular example into a rocket!

They are also prone to this behaviour if mistreated electrically (over charged, over discharged, overheated...).

Such a waste.

"Get some frebreze or something"... Yep that'll help...

I have been sitting, reading a paperback with a booklight, when one of the AA batteries in the booklight spontaneously did this... it just started outgassing with a whine... it went in the sink

wtfabreeze! I believe that gas is like super dangerous... is this non-procreatable individual ok??

What type of battery?

dont remember.... energizer or duracell

I liked digg's interpretation: "You know those paint bombs that end up in sacks of bank money during robbery movies (and probably real life)? We're wondering why Samsung would put a tiny version of those in a phone."

http://digg.com/video/if-you-try-to-beat-a-galaxy-5s-to-death-it-will-fight-back

I am inclined to believe the battery pack being the culprit here though.

All lithium batteries can do this if hit with a hammer. Break the separator that keeps apart the cathode and anode and it will short circuit, resulting in it trying to release all of its energy at once.

To avoid this, don't hit a charged battery with a hammer.