Tesla car charing While the battery industry has made huge strides in ensuring lithium-ion battery cells can perform safely during normal operation and recharging, there is little that can be done once cells are torn apart in a violent collision. (Photo: Alex Kraus/Bloomberg)

(Bloomberg) – Firefighters doused the blazing Tesla Inc. Model X's battery pack, and then company engineers removed about one-quarter of its power cells before the vehicle was deemed safe to tow off of a California freeway.

That didn't prevent the powerful and highly flammable lithium-ion battery cells from reigniting. The car caught fire twice more within 24 hours of the March 23 fatal crash, and again six days later, according to a safety bulletin from the fire department in Mountain View.

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