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AAA batteries

AAA batteries offer an identical voltage to larger AA batteries, but in a smaller package. They also work in the same manner as D batteries , 9 volt batteries and 12 volt batteries.

The advantages of AAA batteries are:

• A high power-to-size ratio - Despite their diminutive dimensions, AAA batteries offer impressive levels of performance.
• Portability - The small size of the batteries allows the equipment that they are used in, whether that is an MP3 player or camera, to be small and lightweight.
• Availability - AAA batteries, both rechargeable and “one use”, can be bought from newsagents, supermarkets and other outlets across the world. You can also buy batteries online at sites such as Amazon and eBay.
• Low purchase price - AAA batteries are typically sold as a multi-pack and are a low-cost investment.

And while AA batteries boast around three times the capacity of their AAA brothers, a wide range of modern technology is being designed that will take advantage of the small size of AAA batteries.

Remote controls, MP3 players, cameras and computer mice have all relied on the power of AA batteries in the past but are now often used with AAA batteries.

Some cell phone batteries have even been developed to run alongside AAA battery power.

Varieties of AAA batteries

Un-chargeable, “one use” alkaline batteries are the most common type of AAA. They are inexpensive and typically offer plenty of power and longevity if used in low-power applications such as television remote controls.

However, the demands placed on MP3 player batteries and digital camera batteries means that standard batteries are often consumed in a short period of time.

Some manufacturers have released special alkaline batteries which are designed for these power-intensive “high drain” applications. They are perfect for use in radio control cars and flash cameras.

Rechargeable batteries are becoming increasingly common and are available in AAA size. They are usually a bit more expensive to buy initially, but should save you money in the long term.

These are commonly NiMH batteries involving technology which offers:

• High-power capacity.
• Good performance in “high drain” devices.
• The potential to recharge the batteries hundreds of times.

Their only negative is that they have a high self-discharge rate and will run out of power over a few months - regardless whether they are used or not. This makes them unsuitable for emergency torches and smoke alarms.

When you buy rechargeable batteries, a mains adaptor and NiMH battery charger will typically come supplied.

Undecided whether to make the change? The simple rule is that if you find yourself replacing your AAA batteries every week or two you may be better off, both environmentally and financially, investing in rechargeable batteries.