AA battery

The AA battery is a standard size of single-use or rechargeable electric battery. It is also known as a double A battery and is commonly used in a wide variety of electronic devices, including digital cameras, remote controls, and portable audio players. The AA battery was first introduced in 1907 and has become one of the most popular battery sizes around the world.

AA batteries typically have a length of 49.2-50.5 mm and a diameter of 13.5-14.5 mm. They can be made using various chemical compositions, including alkaline, lithium, and nickel-metal hydride (NiMH). Each type offers different advantages in terms of energy density, voltage, shelf life, and environmental impact.

Types of AA Batteries

There are several types of AA batteries, each with its own specific applications and benefits:

• Alkaline AA batteries are the most common type, known for their long shelf life and relatively high energy density. They are suitable for a wide range of devices, from low-drain items like remote controls to higher-drain devices like digital cameras.
• Lithium AA batteries offer a higher energy density and a longer shelf life than alkaline batteries. They perform better in extreme temperatures, making them ideal for outdoor devices.
• Nickel-Metal Hydride (NiMH) AA batteries are rechargeable and have a lower environmental impact than disposable batteries. They are suitable for high-drain devices and can be recharged hundreds of times.
• Nickel-Cadmium (NiCd) AA batteries, also rechargeable, were once popular due to their robustness and long life cycle. However, due to environmental concerns over cadmium, their use has declined in favor of NiMH and lithium batteries.

Environmental Impact

The environmental impact of AA batteries depends largely on their chemical composition and disposal method. Alkaline and lithium batteries can be disposed of with regular trash in many areas, though recycling is recommended to recover materials and reduce environmental harm. NiMH and NiCd batteries should always be recycled due to their toxic metal content.

Recycling

Recycling of AA batteries is encouraged to reduce the environmental impact of heavy metals and other toxic substances found in batteries. Many countries have established battery recycling programs to facilitate the proper disposal and recycling of used batteries.

See Also

• Battery
• Battery recycling
• Electricity
• Rechargeable battery
• Single-use battery

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