This why you need the right kind of fire suppression to deal with Li-ion battery fires. In the NASA video you can see how ineffective dry-chemical fire extinguishers are on suppressing the fire.

http://sma.nasa.gov/news/safety-messages/safety-message-item/robosimian-lithium-ion-battery-fire

While this battery was being charged at the time of the fire incident, batteries being shipped in millions of devices around the world still contain that kind of explosive energy. While you cannot stop one battery from burning you can prevent it from spreading to adjacent devices. ...