It cannot be used again for 30 seconds. Even if you need no healing, you can use one in order to use up its power for the next 30 seconds and deny it to your enemies. It is a good idea to know where they are on the map so that you can get to them if you need it. Turrets Turrets are extremely powerful allies to have on your side. If a turret is on your side, it will show up with green crosshairs and will be green in the vision augmentation.
Turrets can see cloaked enemies.
If a turret appears to be firing at nothing, it is probably a cloaked enemy. They only fire at medium range, but they do a lot of damage and they don't miss. Turrets that are on your side stay side even if you die, unless an opponent specifically changes them. When a turret switches teams, it will beep for a few seconds before becoming fully active and firing. If the turret was previously friendly, it is now hostile and should be avoided.