The term "fission battery" seems to imply that the device's functionality is somehow linked to the process of nuclear fission, probably some form of alpha//betavoltaic cell or direct charging generator, which is used to generate electrical energy. Even though the exact workings of this item are never undergone, it demonstrates the pre-War American obsession with nuclear technologies replacing normal tech, as a means of evolution. As the batteries can often be found in robots, they seem to be their primary energy source, along with powering cars, alongside fusion cores. After more than 200 years of inaction, some of the robots can be reactivated, demonstrating that the batteries are a very reliable form of energy storage. Nuclear energy has the potential to maintain a form for excessive amounts of time.
In the post-War society, the fission battery has taken on the role of an on-hand generator. Throughout the Mojave Wasteland, fission batteries can be found in New Vegas streets, remote shacks in the wastes, and reoccupied suburban homes. They are used for powering a wide range of devices like street lamps, electronic signs, lightbulbs, and other household appliances while being easily scavenged from the common robot or appliance store. This makes them invaluable to the common wastelander in the absence of a reliable power grid.
- Reilly's Rangers - A fission battery is required for fixing an access elevator during the quest, at the top of the Statesman Hotel. One can be found inside the hotel if needed.
- A fission battery is used in the construction of the railway rifle.
- A Spoonful of Whiskey - Six fission batteries are required for the Point Lookout repeatable quest.
- Can be used as Rock-It Launcher ammunition.
Fallout: New Vegas
- Cass' moonshine - A fission battery is required to make Cass' moonshine.
- Not Worth a Hill of Corn and Beans - Four fission batteries, along with many other supplies, are needed to repair a food processor in the Camp McCarran concourse.
- My Kind of Town - Three fission batteries and four conductors can be used to reprogram Primm Slim to be the sheriff of Primm.
- A fission battery, along with two pieces of scrap metal, are used to make Sierra Madre chips (listed as 'Sierra Madre Slugs' in-game) with the Coin Operator perk in the first add-on for Fallout: New Vegas, Dead Money.
- Can be converted to energy cells in Honest Hearts
- 19 on shelves and counters in the Franklin Metro utility west rooms.
- Nine are located in Pinkerton's lab in the broken bow of Rivet City.
- Two are located next to a first aid box on a table, directly to the right of Vault 92's vault door.
- Three can usually be found in the Mechanist's Forge in the robot repair center.
- Five are located in Hubris Comics Printing on the lower level, in the first room on the right at the bottom of the southeast corner stairs.
- Five are located on a shelf facing the eastern wall in the lowest level of the National Guard Depot, next to some generators.
- Two can be found in a crate by Dr. Lesko's desk in the Marigold ant queen's chamber.
- Two can be found Next to the VAPL-84 power station in the truck guarded by one or two yao guai.
- One can be found in the kitchen in Zane house in the Minefield.
- One can be found in the yao guai tunnels, behind the player character on a shelf near where the scripted yao guai runs past.
- Three can be found on a table in Smith Casey's garage.
- Three can be found in Gallo's storage closet in the County sewer mainline after killing him and taking the key.
- Three at the store on Scavenger's bridge.
- A great number of fission batteries can be found in the Point Lookout expansion. They will often be found in places one might not expect, such as in suitcases or wardrobes.
- Sold by merchants as a miscellaneous item.
Fallout: New Vegas
- 31 in the basement of the REPCONN test site, and three on the main level of the facility.
- Nine spread over three floors in REPCONN headquarters.
- Nine in Vault 11's living quarters and two in the lower level.
- Nine in Vault 3's recreation area.
- Two in Zapp's Neon Signs in the South Vegas ruins.
- Two in Victor's shack in Goodsprings.
- Eight are for sale in Miguel's Pawn Shop.
- Two can be found in the The Gourmand kitchen at the Ultra-Luxe, where the bathrooms are. Just past the bathrooms, there is a small supply cabinet. They are on the third shelf down, underneath a toolbox.
- One can be found in Michael Angelo's workshop on the New Vegas Strip in the machine shop where the lathe is, across from the fire hose box, on a metal shelf next to the toolbox.
- Can be bought from Old Lady Gibson at the Gibson scrap yard.
- A good amount (around 13) can be found in the Securitron de-construction plant in the Big MT in Old World Blues.
- Inside Vault 22 in a storage room, along with various other items, such as scrap metal and wonderglue.
- A few can be found at Cerulean Robotics in Freeside.
- One can be found in the shack at Southern Nevada Wind Farm.
- Two inside Harper's shack.
- One inside Lone Wolf Radio.
- lobotomites in Big MT. Can be dropped by
- Numerous oversized fission batteries can be found hooked up to streetlights in Fallout: New Vegas. These are apparently used to power their respective streetlights, and cannot be picked up or used for anything else, only as a component of appearance.
- Another oversized battery can be seen in front of Doc Mitchell's house.
- Many oversized batteries can be found attached to portable lamps in various locations, such as Vault 22. These may not be taken and only serve as a cosmetic effect.
- Pioneer Scout Camp terminal: "Before our vehicles ran on the fission battery, we used a totally different source of power. What chemical did we used to use to power our vehicles?"