Battery/ˈbætəri/ Definition 1 of 5Pro Tip 1/3Portable Energy Used to describe small devices that can be carried and are powered electrically. My camera ran out of power; I need a new battery. Pro Tip 2/3Not Reusable Many batteries, especially for gadgets, can't be used again once they're dead. Dispose of the dead battery properly; it's not rechargeable. Pro Tip 3/3Electric Vehicles In modern context, often refers to the large energy sources for electric cars. The car's battery can last for 300 miles before needing to recharge.