Seattle Times has an interesting story about the battery in the 787.
787 battery blew up in ’06 lab test, burned down building | Business & Technology | The Seattle Times
In 2006, a devastating lab fire in Arizona showed just how volatile Boeing’s 787 Dreamliner lithium-ion battery can be if its energy is not adequately contained.
A single battery connected to prototype equipment exploded, and despite a massive fire-department response the whole building burned down.