Plasma battery
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The Plasma Battery is the Covenant equivalent to the UNSC Fusion Coil and is possibly a reverse-engineered Forerunner Energy Core. The exact purpose of it is unknown. However, they can be used as improvised explosive devices due to their explosive reaction to weapons fire. They require more shots than the Fusion Coil to explode. They also require a higher drop to detonate them on impact. It is possible they are a Covenant power source for Plasma Weapons which recharges them when they run out of battery power. These appear in both Campaign and Multiplayer and can be very useful to whomever sees the right moment to detonate it, say near a pack of Grunts. These can also be bought when in Forge, costing a fair price. They can be placed anywhere on the map, even in mid-air. If in a last-ditch situation, you can kill enemies standing near either the Plasma Battery or the Power Core by shooting at it. Any enemy killed using the explosion from a Plasma Battery will be listed as killed by you using an "Unknown" weapon. It appears to have energy shields as part of its structure. There are stacks of them on the level the Ark and can be used to kill nearby enemies. Once one explodes it causes a chain reaction of the explosions of nearby Plasma Batteries. They can only be found in Halo 3.
