As the name suggests, each Reserve Tank provides an "extra" energy reserve of 100 points, with a maximum reserve of 400 once Samus finds them all. They can be set to be used automatically once her base energy is reduced to zero, or to be used manually from the item screen in the menu.
Recharging Samus' energy at her ship can refill the reserve tanks, though recharging at an Energy Station will not. She must otherwise collect Energy Capsules from destroyed creatures to charge them, once her base energy tank capacity has already been maxed out.
Super Metroid manualEdit
"Reserve Tanks act as Samus’ emergency energy source. Reserves Tanks are empty when you collect them."
|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|