Power Cell

The Kraang Power Cells are used by the Kraang for energizing equipments such like their Trans-Dimensional Portal and the Kraang Walker. It was first seen in It Came From The Depths, where Leatherhead was trying to keep it away from the Kraang so they couldn't make their portal work.

History
It Came From The Depths - Leatherhead steals it from the Kraang. The Pulverizer (episode) - Donnie energizes the Shellraiser, the Kraang get it back. TCRI (episode) - Leonardo destroys it. Newtralized! - The Kraang use it in their Kraang Walker.