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A third battery may provide all the desirable attributes, but the price would be too high for commercial use.Battery manufacturers are well aware of customer needs and have responded by offering packs that best suit the specific applications.The Ni Cd is used where long life, high discharge rate and economical price are important.Main applications are two-way radios, biomedical equipment, professional video cameras and power tools.Unfortunately, these super-high capacity Li‑ion batteries are deemed unsafe in the hands of the public and the high price puts them out of reach of the commercial market.In this article we look at the advantages and limitations of the commercial battery.All other chemistries prefer a shallow discharge and moderate load currents.

Emphasis is placed on small size, high energy density and low price. The inscription of Ni MH on a battery pack does not automatically guarantee high energy density.

We often get puzzled by announcements of new batteries that are said to offer very high energy densities, deliver 1000 charge/discharge cycle and are paper-thin. Another battery may be built for long life, but the size is big and bulky.

While one battery type may be designed for small size and long runtime, this pack will not last and wear out prematurely.

The Ni Cd contains toxic metals and is environmentally unfriendly.

Nickel-Metal Hydride (Ni MH) — has a higher energy density compared to the Ni Cd at the expense of reduced cycle life. Applications include mobile phones and laptop computers.

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