Grenades are a blanket term for things you throw. But not everything is a grenade, there are multiple grenades mind you but again its just a blanket term. Grenades are single use weapons with single use purposes and they usually have quick recharges and usually recharge multiple per recharge, both stats can be affected by perks and those same perks go with deployable they go hand in hand but once you run out for the night you are out. Extremely useful when perked into it otherwise a nice side arm literally and figuratively.
Here is a list of all the Grenades in the game there are 14 in total:
All items (14)