Don't say they CAN'T explode... I've blown one pack apart. Fast-charged an RC car pack immediately after running the car HARD (so the pack was hot already) and the charger was of the old timer type. (a resistor and a timer-switch in a box with an amp meter Very common in the late 70's and early 80's for RC cars) The timer picked that charge to fail and at 20 min into a 5C rate charge the pack was swelling fast. We ducked and pieces of batteries were spread in a 20 ft radius.

You do have to REALLY abuse a pack to blow it up... but it can be done.

**********

typoed and typoed correcting the typo.