Weapon Energy

Weapon Energy (武器エネルギー) is an item in the Mega Man franchise. When touched, the item will recover a set amount of energy from the player's current Special Weapon. They are usually found as an item dropped by defeated enemies, but can also be found in stages and by other methods, such as being possible rewards from Eddie. Except for the ones found in stages, Weapon Energy items will disappear a short while after its appearance on the screen.

In Mega Man ZX and Mega Man ZX Advent they are called Biometal Energy (ライブメタルエネルギー, Livemetal Energy in Japan), and the larger ones can be sliced with a saber weapon to create smaller and different types of energy.

Recovery
Like Life Energy, Weapon Energy usually comes in two sizes, small (小) and large (大), but some games contain extra large (特大)/MAX versions that usually completely restores the energy from one or all weapons.

Energy Soul
Energy Soul is a variation of the Soul Item from Mega Man Xtreme 2. It has the same effect of the normal Weapon Energy when collected, but also acts as currency to obtain Parts.

Special Weapon Recharge Cube
Special Weapon Recharge Cube (特殊武器回復キューブ) is an item from the Mega Man Legends series that recharges the energy of the equipped Special Weapon.

Energy Cartridge
Energy Cartridge (E・ エネルギー  カートリッジ) is an object from the Rockman X3 manga that X took from the remains of Dr. Doppler's Victoroid customers to restore his weapon energy before entering Sigma's fortress.