Battery

Batteries are a type of electric power supply used for various devices, namely for portable devices.

Usage
During the Virtuous Mission and Operation Snake Eater, Snake's equipment contains a specialized battery developed by the CIA's Directorate of Science and Technology that runs on Snake's own bioelectricity, which can be maintained by physical activity, nutrition, and other objects, and thus is tied to his own stamina level. He can also replace batteries with ones found throughout the mission.

During the San Hieronymo Takeover, various electronic equipment, such as mine detectors, NVGs, and thermal goggles require batteries to operate. They can be recharged after arriving back at the resistances' truck.

Various equipment of the Militaires Sans Frontieres, as well as its stealth gun, utilized batteries. They usually have a short lifespan, but modifications via the MSF's R&D Team will gradually decrease the use of battery power for most of the equipment until it requires virtually no battery power use to operate. During Item capture missions, some of the crates that the team has to detonate and steal the contents also contain batteries in addition to rations and ammunition, although the batteries are automatically transferred back to Mother Base.

The Mk II and some of Old Snake's equipment runs on batteries.