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Sunday, March 17, 2013
With iPhone, iPad, HTC, and other smart phones, tablet computers become more and more popular in the market, external battery is considered by more and more terminal users to get more power energy outside. However, as there are many kinds of external batteries of different capacity and brands, it is not easy to select a high cost performance one.
Actually, just like many other lithium-ion batteries, the important elements to determine the external power supply quality include lithium-ion cells, protection circuits, interface, connector tip, battery shell, etc.
As a matter of fact, lithium-ion cells are the most expensive part for external battery. That is why the higher capacity, the higher sales price. In USB Phone World, there are 3000mAh, 5000mAh, 7800mAh and 10000mAh versions for selected.
Lithium Polymer battery cells usually select three parts of internal structure, including Aluminum soft packaging, lithium-ion intermediate layer, and other accessories. As for those very slim versions, they select lithium-ion polymer cells external battery that can work flexibly. iPhone 4 has also taken advantage of it.
In theory, lithium Polymer battery cells are more securely than other cells in the market. Of course, as they are more expensive, some normal manufacturers don’t supply such versions inside.
On the other hand, users can also distinguish them from each other from the shape, size, color, brand, capacity, price and so on. Lithium Polymer batteries have higher capacity in size when it can last longer. Of course, users can fully charge it, and discharge to check if the external battery can last long enough as is indicated in specs.
A high-quality External Power Bank should also have got a qualified control circuits to switch output power and keep the whole external battery work in secure and stable conditions. And they are also working as internal resistances to protect it from hurting.
When selecting a new external battery, users should need to learn if they need to charge for tablet computer more than smart phones, and how often will it be charged later. Then it will be easy to determine if a higher capacity one is needed.

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by: USB Phone World

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