The typical AA alkaline battery has a capacity of approximately 2,400 milliamp hours (mAh). However, temperature affects the capacity of all alkaline batteries. Warming the battery increases the capacity slightly and cooling decreases capacity.
The current AA battery was standardized by the American National Standards Institute (ANSI) in 1947 but was commonly used in devices such as flashlights earlier. AA alkaline batteries are made in disposable and rechargeable varieties and represent over half of all general battery sales as of 2015. Zinc-chloride batteries, known as heavy duty or super heavy duty, have less capacity than alkaline and are disposable only. Nickel-cadmium (NiCd), nickel metal-hydride (NiMH) and lithium ion (Li-ion) are common AA rechargeable batteries.