First one I found was in Parford lake in that big wizard tower. not much else to say here its pretty easy to find

I got this one from the quest line. Again no biggie for this one they drop a pin on the piece so that's done.

After doing the quest you can hop back into the Pillars of Misrafal. The piece is located in a cave under the broken bridge right across from when you spawn in.
Can't remember the puzzle order to light the fires. i just brute forced that one lol. There's only 3 fires so it shouldn't be too hard to get it.

This last piece is in the Fal Fadir Oasis. Once you spawn in there is a raised spot you can kinda see beyond the gate with a bunch of lit up palm trees. There is a building over there with the piece inside.All you gotta do is hit the green crystals before time runs out and that'll open the door.

This is my first guide so apologies if it was kinda ♥♥♥♥. Hope it helped a little bit :)

Edit: So I guess there's more than just those, but hey at least you got the charge