Chinese firm tests battery ejection tech to prevent fires in electric cars. EV fires, notoriously difficult to extinguish once they start, remain one of the toughest challenges for carmakers. A battery pack that weighs hundreds of kilos is about as far from harmless as a projectile can get. For all the spectacle, the so-called missile-style ejection system is a dead end. Lobbing a half-ton battery into traffic is not a safety feature, it’s a liability with wings.