Energy-based weapon
From Tribes2Wiki
Energy-based weapons, or simply energy weapons, are weapons that have infinite ammunition, but require energy to use. Whenever you fire an energy weapon, your energy will decrease a certain amount. You cannot fire an energy weapon if your energy is below what that weapon requires.
[edit] Energy-based weapons in Tribes 2
The default game consists of the following energy weapons:
Note: The targeting laser isn't really a weapon, because it does no damage. Its energy drain is so small that it barely slows the rate at which you regenerate energy while you use it. None-the-less, if you run out of energy, your targeting laser will turn off for a moment.