When you need a universal external battery

Alexey Gavrish
08.02.2016

When do I need a universal external battery?

The main requirements that we place on modern gadgets are mobility and, as a result, autonomy. The batteries of most smartphones, tablets, mp3-players, GPS-navigators fully meet this requirement in terms of the daily routine of a megalopolis resident: he took it off in the morning, put it on charge in the evening. However, each of us at least once encountered a situation where, even in such conditions, we cannot do without a spare external battery.

How to choose an external battery?

Constructivelyexternal battery(Power Bank) is an array of batteries that are placed in a single package equipped with a universal output. Such devices can differ in a complete set, design of the case, capacity of the used batteries and other characteristics. Do not differ only in scope - they are designed to charge the battery of a mobile device.

What should be the battery capacity?

The capacity of batteries installed in a portable battery is indicated in milliampere-hours.The most common types of batteries are lithium-ion or lithium-polymer, having a low self-discharge current, high specific energy consumption and good performance characteristics.

Two external batteries

Very often, the required capacity is calculated as follows: they simply divide the capacity of an external battery by the capacity of the charging device. In theory it is true, but in practice a certain error is obtained. Even the best universal 9000 mAh battery will be able to give a full charge to a smartphone equipped with a 3000 mAh battery, two, maximum two and a half times.

Where does the energy go?

For any battery is characteristic of what is called the minimum self-discharge. In addition, the performance of any battery deteriorates over time. The battery voltage in external batteries is 3.7 V, but may vary depending on the charge level. The output voltage of USB or memory is 5 V; therefore, special circuits are used, the task of which is to increase the voltage to the required one. The efficiency of such a scheme can vary greatly depending on the model. The charging device also has a circuit, but already a downward one.As a result, at each stage we lose some of the energy.

What current is needed?

Another selection criterion is the charging current, which providesexternal battery. In most cases, it ranges from 0.5 to 2 A. It makes sense to choose the Power Bank, which is capable of delivering more current than that required by the charging device.

Battery in metal case

Among the universal high-capacity batteries, there are models with two output connectors. In this case, they will be different charging current. For example, one will issue 2 A, and the second 1 A. In fact, they are intended to charge several devices, depending on the required charging current. For smartphones it is at the level of 1 A, for tablets it is from 1.5 A. It is only necessary to remember that when simultaneously connected, both outputs will have the same current at the level of 1 A.

What else to pay attention to?

It would seem that the most capacitive models are exactly what everyone needs, but the capacity of an external battery is not the only criterion. Such devices are also the most heavy and overall. For everyday wear "just in case" they are uncomfortable. For these purposes, the market offered a segment of small-sized devices, the size of not exceeding the usual keychain. Their capacity is small, but if necessary, they can give half the charge to the smartphone battery.

Mophie battery

Most modern gadgets for charging use a universal micro-USB connector, but users who plan to charge older devices should pay attention to the models that come with a set of universal adapters.

How to charge the external battery itself?

Another important parameter to consider when choosing is the method of charging the Power Bank itself. Budget models for charging use their own connectors. Much more convenient devices using micro-USB, as in a smartphone or tablet. It is worth paying attention to the charge indication. This is usually a series of LEDs, but in the top models information can be displayed on the screen.

Our recommendations

On the Internet, it is easy to find detailed professional reviews and benchmarking tests. We will limit our article to recommendations based on user feedback.The best universal batteryGP GL301 (average retail price $ 40) is most often noted, HIPER MP7500 ($ 25) for phones, TOP-MINI ($ 18) for tablets, and HyperJuice MBP1.5-222 ($ 380) for high capacity.

Screen batteries

Choose your Power Bank carefully. This is a fairly simple device, so the range is very wide. This leads to the fact that there are low-quality models on the market. Compare your preferences with the experience of other users.If the feedback from consumers is mostly positive for the selected external battery, then the probability of purchasing a defective product is minimal.

In any case, now that you have become familiar with the basic nuances, you will have every chance not to get confused and choose exactly what suits you.

The video presents an overview of the Power Bank using the example of the NOMI model line


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  • When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery

    When you need a universal external battery