Power Bank For Phone-White&Purple

 Any person at least once in his life has come across an untimely discharged battery of an urgently needed electronic device, and many of us have such a nuisance on a regular basis. The way to solve the problem is simple - you just need to get a compact external battery, recharge it in a timely manner and do not forget at home when going on business. We bring you a ranking of the best powerbanks of 2020, compiled by reviews from experts and ordinary buyers.

Just do not forget - in order to choose the best external battery, you need to really assess your needs and choose a device with the optimal capacity. As a first approximation, its value should be two times higher than the corresponding indicator of the battery of the gadget, which is supposed to be charged most often.

By specifying the passport capacity for their external batteries, manufacturers write the truth, but not the whole thing. For example, the 13,000 mAh claimed for the Canyon CNE-CPB130, its built-in battery does. Only now it will be possible to fully charge a smartphone with a 4000 mAh battery with such a power bank only twice. The fact is that the nominal capacity here means the energy reserve accumulated by the device battery at its operating voltage. In this case, it is approximately equal to 3.7 volts, which is noticeably lower than the value determined by the USB specification. And insofar as it is necessary to charge mobile equipment through this particular interface, the internal voltage is converted to standard 5 V with a proportional decrease in the available capacity. In addition, part of the energy is spent on the operation of the corresponding electronic circuit. For reference: currently external batteries use lithium-ion (3.6-3.7 V) or lithium-polymer (3.85 V) batteries, and the efficiency of the converters is in the range from 0.9 to 0.95.

Thus, knowing the "capacity" of the power bank and smartphone batteries, it is easy to calculate how many times you can charge the second device with the first device. To do this, the passport value of the capacity of the external battery must be multiplied by the operating voltage of its own battery (if the type is unknown, we take 3.6 V), divided by 5 volts of the USB interface, and the result must be multiplied by the efficiency (set by 0.9). As a result, we get the useful capacity of the device, which can be used when charging.

Completing our example, we have (13000 * 3.7 / 5) * 0. Power Bank For Phone-White&Purple 9 = 8658 mAh, which is enough for two full charges, say, Xiaomi Redmi 4X with its 4,100 mAh battery. And a little more will remain "in reserve".

The electronic part of inexpensive external batteries does not allow fast charging of several consumers at the same time. Already when the second load is connected, at all output connectors of such a Power Bank, the voltage drops to the standard 5 V. Against their background, the recommended model really looks like a universal, insofar as it has independent control circuits for Type A and Type C ports, built on two different controllers. In addition, the Mi Power Bank 3 Pro uses a pair of 10 thousand mAh batteries each, as well as a special chip for their integration and voltage equalization. In fact, we are offered two partially self-contained external batteries in one case, so Quick Charge and other supported fast charging variations work with almost any combination of consumers. Naturally, with a simultaneous load on both Type A ports, the power output is divided "like brothers". But there is also an oddity. If your smartphone supports USB OTG, it cannot be charged via the Type C port.

A good universal power bank. Supports 20 volts for laptop charging. Can charge two devices at the same time in QC mode.

Continues our rating of the best external batteries HIPER MP10000. The HIPER brand is deservedly popular among the owners of mobile gadgets. Compared to numerous competitors, external batteries from this manufacturer are characterized by good durability and versatility. The integrity of the case is ensured by thick enough aluminum, thanks to which the device is not afraid of falls. As for such a vague characteristic as versatility, judge for yourself. Firstly, the dimensions of the MP10000 still allow you to carry it in your pockets, and the battery capacity is enough to fully charge almost any device. Secondly, the battery comes with a solid set of adapters. Thirdly, the built-in slot for microSD cards, on occasion, allows you to use the device as a card reader. For example, 

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