AA battery
Encyclopedia : A : AA : AAB : AA battery
An AA battery (pronounced either "ay-ay" or "double A") is a dry cell-type battery commonly used in portable electronic devices. Electrical output of alkaline batteries in this size is 1.5 volts, 1800 to 2600 mA·h, while rechargeable batteries commonly output variably 1.25 V. The output of an AA battery is the same as that of an AAA battery, but AA batteries provide power for a longer period (hence their larger size). An AA cell measures up to 51 mm long, 15 mm in diameter, and weighs approximately 23 g (1.97 x 0.56 inches and 0.81 ounces).
The capacity of rechargeable AA batteries varies with the technology used. Nickel-cadmium (NiCad) AAs with a capacity of 650 to 800 mA·h are commonly available, while 800 to 1000 mA·h are rarer and more expensive. Nickel metal hydride (NiMH) AAs are available in various capacities ranging from 1400 to 2700 mA·h.
NiCad AAs are commonly used by people powering model cars or other (relatively) high-current-draw devices, where the older NiCad technology performs better than NiMH. NiMH AAs designed for high current applications are beginning to become available; these use different construction and have lower capacity (1400-1600 mA·h) than the highest capacity NiMH cells.
Recently, AA-sized batteries have been introduced in Li-ion format [link], however, these batteries do not supply voltage in the 1.5 V range and are not true AAs.
See also
From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.