If you purchase an LED flashlight that requires AAAA batteries you can purchase them here or at your local Radio Shack. Coin cell batteries that are used in our LED key chain lights can be purchased at a local Wal Mart or local Radio Shack. Generally any store that carries speciality batteries for cameras,car remotes and cell phones will have these types of batteries. In an emergency situation you find AAAA cells inside of a Duracell 9 volt battery. This is only for emergency use only and they should be wrapped in electrical tape before use.