**** WARNING: GRAPHIC IMAGES ****
The only reason I'm sharing the actual media link, is because this particular instance was reported properly.
THIS IS THE REASON YOU DO NOT CARRY BARE LITHIUM ION BATTERIES IN YOUR POCKET.
This is a case of user error, as are all instances of "e-cigarette explosions". PLEASE take care when transporting your batteries. EVERY SINGLE vape shop will (or at least SHOULD) carry battery cases for sale. Avoid situations like this, and exercise proper battery safety.