About Electrical Burst is a written note found in Death of the Outsider.
Transcript
Remember those old wall of light parts we found near the dockyards? Well, I found a way to make use of them. Turns out there's a part in them that powers the whole thing. So I took it out of all the rusty coils and now we got these little things to stun folks if they get out of hand. I call them 'Electrical Burst'. You're welcome.
I've already seen folks sling them at rats to keep them out of the storerooms but it makes them tense up and ruins the meat. Can't even make liquor from them when they're like that. Better to use them on larger vermin, you get me?
One last thing: Do NOT touch the tip. And by the Outsider, do NOT lick it! I wish I didn't have to make that clear, but Lacie did on a bet and it took hours to wake her up, and now she's got no eyebrows. (Not from the electricity, just because someone shaved them off when she was out cold. But we told her it was the electricity.)
-Leon
Location
This note can be found with some Electric Bursts near the Albarca Baths during the mission One Last Fight.