EXPLODE is right. Happened right next to my friends. My buddy put his IB42000 on the Indi dishcarger. Started cleaning working on his truck. Dishcarger finished. He disconnected the batter and set it on his towel to cool. Few minutes later KAPOW! Pieces falling from the ceiling and then the camera phones started going crazy. Looked like some one had built a firecracker pack not a battery pack. Every cell was toast but I don't know if one cell caused the other to errupt or they all chain reacted or something.