Monday, September 24, 2018

Users who are somehow interested in mobile devices, probably heard external batteries. The name of the device reflects its essence - it's a battery that can charge the battery of another device.Power Bank, this is the so-called external battery in English, it is usually a small device that fits freely in your bag (sometimes even in your pocket), and its capacity is often enough to charge a couple of times your smartphone. Today we would like to talk about what it is worth paying attention to when buying Power Bank.

External battery capacity

Perhaps this is the first thing you should look at. First, decide what capacity do you need. 

As an example, take a battery with a capacity of 5200 mAh (milliampere-hours). 

Let's say that the capacity of the smartphone battery is 2500 mAh. This means that with an external battery you can charge the smartphone 2 times (here you must include a small loss of energy). Accordingly, based on this, you must decide whether you have enough of this capacity of Power Bank or not.


As for the maximum capacity, then on sale you can find external batteries, the capacity of which is several tens of thousands of mAh! However, you should be aware that such a device has such dimensions that it hardly fits into a woman's bag.

Another important point is the voltage at the output of the external battery. 

It can differ, and this, in turn, can lead to the fact that external batteries that have the same capacity, but different voltages, in reality will contain several different amounts of electricity. However, the difference should not be significant.

Current strength
This important parameter affects primarily the charging speed of the gadget. For example, if you are trying to charge a smartphone with a 0.5 amp battery, it will be charged one and a half to two times slower than from the same battery, but with a current of 1A.


Optimum current for the tablets is 1.5-2A, otherwise it will be charged very slowly.

There are batteries that support the current from 3A and even higher, but for the smartphone will be enough 1A. Moreover, such current strength favorably affects the operation of the battery of the device that you plan to charge.

Dimensions
An extremely important parameter. If you have a backpack or a bag that you carry with you all the time, it probably does not make sense to think about the dimensions of the Power Bank. Another thing is if you plan to keep an external battery in your pocket.




As a rule, the capacity of an external battery depends directly on the dimensions: the smaller the housing, the smaller the capacity. Therefore, it is recommended to pay attention to both the battery capacity and its dimensions.

Declared and actual capacity
Unfortunately, not all batteries show the declared capacity. For example, there are cases when, with the claimed capacity of 5000 mAh, the actual capacity of the gadget barely reached 3000 mAh. What is the reason for this? There are two options: either the manufacturer deceives the company, indicating inaccurate data, or the case of improper storage and transportation.

What to do? Read reviews: there are a lot of users among those who do not mind checking the actual capacity of an external battery. Based on feedback, you can draw conclusions.

Housing material
Here everything is strictly for the amateur and, in fact, there is no difference, plastic is made of a body or of metal. Another thing if you like tactile sensations. By the way, on sale there are accumulators, the case of which is made of wood.


Additional bonuses
For bonuses can be attributed, for example, the presence of several USB-ports. They are needed so that you can simultaneously charge several different devices. As a rule, small in capacity and in size, the batteries are equipped with 1-2 USB ports, large ones - 8 or even more.


Also worth paying attention to the indication of charge-discharge of the battery - it can be LED, or in the form of a screen, which shows the battery discharge in percent.

In a set of some external batteries you can find all kinds of adapters - quite a nice bonus.
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