Duracell is an American brand product line of batteries and smart power systems owned by Procter & Gamble. Duracell manufactures alkaline batteries in many common sizes, such as AAA, AA, C, D, and 9V. Lesser-used sizes such as AAAA (primarily for pagers, penlights, and blood glucose meters) and J size batteries (for hospital devices and photographic strobe flash units) are also manufactured along with a range of “button” batteries using zinc-air, silver-oxide and lithium chemistries, used in calculators, watches, hearing aids, and other small (mostly medical related) devices. Duracell also manufactures specialty batteries, including NiMH rechargeable batteries and batteries for cameras, watches, hearing aids, etc. Their two main battery brands are “CopperTop (Plus),” marketed as longer-lasting, and “Ultra,” directed mainly at users of digital devices and devices that need more power. Duracell also has a line of lithium chemistry batteries and products.