Comment Re:what happens when a cell phone battery explodes (Score 4, Informative) 97
User was installing a new battery that failed due to shorting when installed.
Another story of it happening and photo of the aftermath
http://miami.cbslocal.com/2014...
Different incident. User dropped the phone and the physical damage caused the battery short.
The typical failure mode from dendrite formation is the battery slowly drains itself from the high resistance connection between the cathode and anode that forms, and not a thermal runaway but it can happen. This is a common failure mode for NiCad batteries, but Lithium batteries are much more heat sensitive and the electrolyte when heated too much can release oxygen to fuel a runaway reaction. Battery failures in portable electronics are typically due to physical damage or poor quality chinese made batteries, especially when they omit the protection circuits.