Grapple Voltage

From Wikitroid, the Metroid wiki

The Grapple Voltage uses the Grapple Beam and gives Samus Aran the ability to either siphon or give energy to objects and creatures. It only appears in Metroid Prime 3: Corruption. It is obtained after defeating Gandrayda. The Grapple Voltage is directly tied to Samus's PED Suit. If she siphons energy from something, she gains energy, though if she gives energy, she loses her energy. Note that giving up energy to another is a gameplay mechanic - Phazon enemies can be overloaded and explode, and during a certain part of the game, Samus is practically required to lose energy via this method. Like most things in the game it has a hypermode counterpart called the Hyper Grapple.