Disposable primary batteries are replaced once the energy supply is depleted. Their energy is produced when the materials within the battery react and are exhausted. Common chemical chemistries for disposable primary batteries include zinc-carbon, zinc chloride, magnesium, alkaline-manganese dioxide, mercuric oxide, silver oxide, zinc / air, and lithium. In the United States, disposable primary batteries carry designations such as AAAA, AAA, N, 1/3 AA, 2/3 AA, AA, 1/2 A, 2/3 A, A, 4/5 Cs, Cs, C, 1/2 D, D. Nonstandard disposable primary battery include prismatic cells, coin or button cells, sachet cells, lantern batteries, and battery packs.