If you want to have some fun, take an 18650 battery cell (the same cells in most cordless tools and laptops) and drive a galvanized nail through it. Don't use a hammer like you would driving a nail into a board; instead drive the nail all the way through a scrap of 2x4 and hit the battery cell with the nail in the 2x4 like a club. It's pretty cool to watch. Obviously, do it outside, well away from anything flammable.
Lithium battery cells are more power-dense than dynamite.