lithium-ion batteries

NTSB

Boeing will soon start testing its redesigned Dreamliner battery. Battery experts say that means engineers will have to experiment with flammable lithium-ion batteries to see if, well, they explode. 

Engineers subject the batteries to something called safety abuse testing — crushing them, sticking nails in them — to see what happens.

So how do engineers manage to stay safe? 

The trick, according to battery expert Dan Doughty, is to not get too close.