The Energy Tank (エネルギー缶, Energy Can), also known as the E-Tank, is an item from the Mega Man universe.
Introduced in Mega Man 2, Energy Tanks are recurring single-use items which Mega Man can use at any time to fully restore his health. They can rarely be found in levels and often require using specific items or traversing hidden or dangerous areas to reach; however later games made them purchasable in shops. Mega Man can also carry a limited number of Energy Tanks. Later games introduced similar items which restore Mega Man's weapon energy (the W Tank), or both his health and weapon energy at the same time (the M and S Tanks).
Energy Tanks appear in SSB4 in two main roles.
As a trophy
The Energy Tank trophy appears in both versions.
These restore Mega Man's health. You can keep any you find and use them from the menu at any time. They first appeared in Mega Man 2. Later titles added items like Mystery Tanks, which also restore weapon power, and Mini E Tanks, which grant you an Energy Tank when you collect four.
In Smash Tour
In Smash Tour, Energy Tank is a red item. A player can use an Energy Tank at the beginning of a battle to be healed by 50% damage should their damage exceed 100%. It is functionally the same as the Fairy Bottle.