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Lithium is the most reactive of the "standard" Elements.
If they burst or otherwise leak the lithium will bond with oxygen leaving hydrogen in the air to blow at any spark.
If the batteries short (like non taped cell batteries for example) they create a plasmatic explosion that's over 2800°f and truly permanently blinding.
And if it gets wet (like water separation in refining) with a distilled bath it creates lithium hydroxide. A toxic base that is deadly on its own and explosive. Add to that mercury or rhodium or fluoride or any of dozens of other elements you get a plasma ball that can decimate a warehouse or even a city block.
There's also extensive regulation in handling it (rightly so).
I've mentioned before that nice oval hole in my bench in many of my photos was from a battery. A tiny one less than 1/5th inch that shorted.
Think what a dozen button cells can do if they go at once!

dilithium crystals were used to power the Starship Enterprise of the first star trek series...you could look it up

Lol. Jim we need more power! Shut down life support!
More realistically LiTFl is a powerful enough reaction pair to create propulsion plasma but you need a shielded reaction chamber strong enough to contain the plasma charge of LTF in a large enough reaction to reach FTL through a sub space string fold via insulating spacetime bubble.
But now we're in a different quadrant than the op!