Reload is generally reserved for weapons that shoot solid projectiles, e.g. bullets, shells, bombs, rail gun, sling-shot, etc. Damage is caused by the shape of the projectile (usually rounded or pointed at the front) of the projectile), and the kinetic energy given to it by the propellant that forces it forward, (gunpowder, compressed air, elastic band, centrifugal force, etc). Also, especially for shells and bombs, damage is increased by them containing an explosive charge). These weapons can run out of ammunition, but as soon as new ammunition is loaded, the weapon is instantly available for firing, assuming that it has not overheated.
Recharge is generally used for weapons that emit some form of energy (other than kinetic energy in the form of a fast moving solid projectile), e.g. ray-gun, laser, phasar, pulse cannon, etc. These weapons can never run out of ammunition, but they can run out of energy. When this happens the weapon has to have its batteries (power cells, capacitors, energy stores, etc) recharged from another energy source. This may take some time, depending on the power of the weapon, the amount of energy available from the energy source, and the amount of energy that can flow between the power source and the weapon.
From the context of your question, it sounds like your weapon needs to be recharged.