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Energy Cells are small green cylinders that appear in Metroid Prime 3: Corruption. Energy Cells are a portable source of power similar to batteries. Despite their small size, they have a very large capacity for power, making them useful for a wide range of energy applications.
Energy Cells are often used to power doors and run machinery throughout the Federation. As such, Energy Cells were present on the G.F.S. Valhalla. When the Space Pirates invaded the ship, killed every tripulant and took Aurora Unit 313, they took all Energy Cells so that they could use them as energy sources for other machines. This means that the 9 Cells were carried to several planets, including the Pirate Homeworld.
On the G.F.S. Valhalla, Fuse Hint Scanbots can be scanned to download hints to the Inventory as to the locations of the missing Cells. This helps Samus to know where to retrieve them. The Energy Cells are the final key item quest in the game, in the same way the Chozo Artifacts (in Metroid Prime) and the Sky Temple Keys (in Metroid Prime 2: Echoes) were. Samus finds some of them during her travels without knowing yet their usage, but needs them to gain access to multiple areas of the G.F.S. Valhalla, including one containing the vital clue to access Phaaze, the source of all Phazon and the final area of the game. Something that makes the Cells different from the Artifacts and Keys is that, because of their connection to machinery, their removal causes sometimes negative side effects. Additionally, not all of them need to be obtained to access the Leviathan Command Codes. The Cells' locations are (ordered by planet, not according to the data storage):
- Generator B in Norion, the only part of the planet that Samus doesn't explore at first (this is because Rundas already activated the generator during the initial invasion). The area is protected by a Metroid Hatcher, and removing the Cell from its spot re–opens the entrance door (it initially closes after Samus enters the room).
- Hangar Bay in Bryyo, it can be taken when Samus Aran's gunship is about to receive the Ship Missile upgrade. Removing it from its spot shuts off a force field blocking the way to the Hall of the Golems.
- Hidden Court in Bryyo, arguably the most difficult to obtain in the game, because its collection requires the connection of two entire regions of Bryyo and the careful carrying of extremely heavy objects (with the help of the Ship Grapple). No notable side effects occur.
- Xenoresearch B in Elysia. Samus is forced to remove it from its spot in order to obtain the Seeker Missile launcher. In the process she also releases a batch of Phazon Metroids.
- Ballista Storage in Elysia, the same battle arena where the Defense Drone is fought (however, collection of Grapple Voltage on Pirate Homeworld is required). Removing it just leaves the cooling system offline.
- Command Courtyard in Pirate Homeworld, mandatory to collect (in order to turn off Ventilation fans and access Flux Control).
- Metroid Processing in Pirate Homeworld, it can be taken during the search of a missing soldier. Removing it frees the imprisoned Metroids, and a Missile Expansion can be collected.
- Phazon Quarry in Pirate Homeworld, it can be taken after collecting the Nova Beam, and doing so removes an energy barrier, which gives Samus a shortcut to exit the mines more quickly.
- Docking Bay 5 entrance on the wrecked G.F.S. Valhalla. It is not powering any station and is just lying under a smaller crashed ship.
"Portable GF Energy Cell. This unit must be returned to restore room power."
Used as a power source in Federation technology.
Energy Cells were designed as a portable power source for the Federation. Their high power-to-weight ratio makes them ideal for powering a wide variety of equipment. Throughout the environment you may encounter stations that contain an Energy Cell. Removing the cell will leave these stations permanently offline. You will then be able to place the collected Energy Cell into a new station that is empty. Your collected and used Energy Cells are recorded in your Inventory.
- A Portable GF Energy Cell is found on the Olympus and is used to keep a certain room functional. However, this Cell always belonged to that ship, not the G.F.S. Valhalla. This means that there are actually 10 Cells in the game.
- Energy Cells are referred to as Fuses in the game's data.
- Oddly, in Generator A, B and C on Norion, if Samus looks at the alcoves at the sides of the room, she can see mechanisms to put Energy Cells into, but she is unable to during the course of the game. It is unknown what these mechanisms would do if Samus put an Energy Cell in one. Generator B's Energy Cell was obtained from a similar mechanism, but did not seem to do anything.
- Interestingly enough, when Samus is looking for Bryyo's second Cell and is carrying through her gunship the head of Colossal War Golem, and she tries to place it on the body of the statue, her Command Visor says that there are no valid targets in the area. However, this is referring to the ship's capability to Bombing Run the (uninhabited) area, and players who don't understand what the visor is talking about may become confused.
- Bryyo is notably the only planet whose Cells are found in the same major area. The ones located in both Elysia and the Pirate Homeworld are distributed equitably across their main segments.
- Five Cells are required to clear the game, but there is a glitch (involving the use of the Screw Attack and respawning from a fall onto a distant ledge) that helps the player to do the same with only three.
- Energy Cells distinctly resemble Afloraltite crystal containers from the Metroid Manga, suggesting that that might be what Energy Cells contain.
- Based on their large size and the amount of them, it is unknown how Samus is able to carry them all. This fact is made more confusing as they are not seen during cutscenes where Samus is seen.
- Each Energy Cell's coordinates are a contraction of the corresponding room's name within the game files. For example, the coordinates of Energy Cell ID: GC-9713N-5, 13S-MET, refer to the internal name of Xenoresearch B, which is 13_skytown_metroids.
- Interestingly, the purely alphabetical characters in the ID of almost every Energy Cell correspond to a Nintendo console:
|1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Portable GF Energy Cell|
|Power Suit||Energy Tank • Reserve Tank • Energy Part • E-Recovery Tank • Power Bomb Expansion|
|Beam||Universal Ammunition Expansion • Beam Ammo Expansion • Accel Charge • Ship Grapple Expansion|
|Missile||Missile Expansion • Super Missile Tank • Ship Missile Expansion|
|Keys||Chozo Artifact • Alimbic Artifact • Cartograph Artifact • Attameter Artifact • Binary Subscripture • Octolith • Dark Temple Key • Sky Temple Key • Energy Cell|