Fortnite Active Powercell is a crafting Fortnite material. Seldom found in strange places and chests. you can use it crafting Legendary Assault Rifles, Legendary Pistols, Legendary Shotguns, Legendary Sniper Rifles, All Legendary Melee Fortnite Weapons

NO.1 How to get Active Powercell

The active power cell is the next step above rotating gizmos. You need this resource for crafting assault rifles, pistols, shotguns, sniper rifles, and all melee weapons of a legendary rarity. With active power cells, you will start to encounter them in the same areas you would find rotating gizmos but will begin facing them more at higher levels. This means chests, toolboxes, and garden gnomes should all be checked. Always break garden gnomes.
level 6/7 chests tend to have one
level 4/5 Chests sometimes
storm chests
treasure encampment(low chance)
Storm chests and some campsites (low drop rate) have them.
most of mine come from mission rewards
Red tool boxes and other hardware items have it. Best bet is high-level chests like others have suggested. If you are very low, I will consider leveling a decent purple up, so you're not using so many
Running a loot find Outlander, with another in the support slot that also boosts your loot find is the Best way, then grab chests. And smash gnomes.
Just searching for anything in the game seems to have a decent chance for it in Hex and early/mid plank. Even late Stonewood could find a few permission.

NO.2 Cyber Ranged Weapons Crafting With Active Powercell

NO.3 Cyber Melee Weapons Crafting With Active Powercell

NO.4 Assault Rifles Crafting With Active Powercell

NO.5 Shotguns Crafting With Active Powercell

NO.6 Pistols Crafting With Active Powercell

NO.7 Sniper Rifles Crafting With Active Powercell

NO.8 Swords Crafting With Active Powercell

NO.9 Axes Crafting With Active Powercell

NO.10 Spears Crafting With Active Powercell

NO.11 Scythes Crafting With Active Powercell

NO.12 Clubs Crafting With Active Powercell

NO.13 Ranged Vacuum Tube Weapons (Holiday Survival) Crafting With Active Powercell

NO.14 Hydraulic Weapons (Storm Zone) Crafting With Active Powercell

NO.15 Dragon Weapons (Spring It On) Crafting With Active Powercell