To test safety of Li-ion batteries, a 18650 cell was hammered, yielding to an explosion.
<p>Frame from video clip 
</p>
<a rel="nofollow" class="external free" href="https://www.youtube.com/watch?v=8iJGWsgaUWY">https://www.youtube.com/watch?v=8iJGWsgaUWY</a>
<a href="//commons.wikimedia.org/wiki/User:Tavoromann" title="User:Tavoromann">Tavo Romann</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>