They sure do. They use Lithium-ion type cells

It can be lithium polymer or lithium iron phosphate but they are all classed as Lithium-ion

Lipo, lip, li-poly are the same type, Some just use different chemistry but are classed as lithium-ion

They have super high energy density and have great weight to power ratio compared to some older battery technology. This is why EVs use them.

Put 20-30 lead acid batteries in a EV and see how fast that can move.

They are also if not treated right or physically damaged can have an catastrophic thermal runaway. You do not want to be near one of it goes up. They are getting safer and have many safety features built in but EV batteries are not much different from the one in your phone or laptop.

Why do you think the emergency services have special training to deal with a EV it’s not like a normal car fire