How to choose an external battery

Modern mobile devices, smartphones and tablets are productive device that suits almost everyone for one exception – the battery lasts for a short time, and he sits, as a rule, at the very Wrong moment. To be able to recharge the phone directly in the field, external batteries are intended, or power banks, as they are also called. It is for this reason that the choice An external battery needs to be approached with the entire responsibility.

choose an external battery

Top Power Bank Manufacturers

When choosing a portable battery, preference should be given microelectronics market leaders whose assortment includes a large number of similar devices:

  1. Meizu;

  2. Xiaomi;

  3. Samsung

  4. Toshiba;

  5. Acer

  6. Nokia

When choosing a power bank, it should be taken into account as specific device specifications, form factor and capacity, and reviews and opinions formed about it in the process long operation. This information will in some cases become decisive for a specific customer, rather than beautiful numbers in advertising booklet.

Types of portable batteries

Despite the general principle of operation and purpose, power banks are divided into the following conditional groups:

USB rechargeable batteries

USB rechargeable batteries

Classic form factor, assuming two separate inputs – one of which serves as a weekend and is intended for charging connected devices, the second – by the input and is intended for replenishment of the capacity directly of the power bank itself. Make up for energy using both a USB port on a computer and networks in 220 and 12 volts with appropriate adapters.


  • Decent functionality;

  • Charged by USB, ordinary socket or cigarette lighter a car;

  • Able to provide up to 5 cycles of a fully charged mobile phone or other similar devices;

  • Compact size;


  • Quality road devices;

  • Useless when discharged away from sockets;

Power banks equipped with a built-in dynamo

Powerbanks equipped with a built-in dynamo

Devices whose principle involves recharging not only through an external power source, but also through built-in dynamo. For this purpose a special a knob turning which the user generates electricity, which goes to charge the battery. The rest of the device identical to classic power banks.


  • Small dimensions and minimal weight;

  • A variety of options, varying in size, capacity battery and functionality;

  • Charging both thanks to the USB port, as well as the built-in dynamo cars;


  • More expensive than the usual options;

  • The tendency to failure of the mechanical part of the device;

  • Renewing energy through a dynamo is enough slow

Batteries with integrated solar panel

Batteries with integrated solar panel

Recharge not only from the USB port, but also with energy of the sun. For this purpose, a special solar a panel located on the outside of the device.


  • Small dimensions;

  • Various models in size and battery capacity;

  • Charging from 220 and 12 volt networks, as well as using energy the sun;


  • Expensive;

  • Slowly recharged from the sun;

  • Useless in cloudy weather and in the dark days;

Portable Battery Options

criteria for selecting an external battery

Built-in Battery Capacity

The main criterion for how many charge cycles cell phone can withstand powerbank without the need for recharging. Measured in milliamperes per hour – a traditional value, characteristic of all electronic devices. To determine approximate resource of the device, it is necessary to divide its capacity on the battery capacity of a rechargeable smartphone, rounding off the received value up to integers.

If the battery of your iPhone has a capacity of 3000mAh, and portable powerbank is equipped with a “battery” of 15,000 mAh, the number of full charge cycles will be from 4 to 5, depending from outdoor temperature and operating conditions.

Pay attention to the compliance of real and declared capacity figures. This is very often the sin of the Chinese manufacturers, posing as “weak” power banks for powerful devices. For this reason, it is strongly discouraged buy the cheapest models;

Features of choosing an external battery for the phone by strength output current and voltage

The output current of the USB port is the main parameter that determines charging speed of the connected device.

  1. Headlamps and other compact devices, not equipped with a capacious battery, do not require excessive output current. A magnitude of 500-750 Miles is enough for fast charging;

  2. Action cameras, cameras, push-button mobile phones will require for fast charging the output current with a power of 1-1.2 Ampere

  3. Smartphones, tablets and other electronic devices are capable of effectively charge only from a current of 2-2.5 amperes. The use of a source with less power will stretch the replenishment time energy up to 100% up to 4-5 hours;

As for the charging voltage, the whole modern microelectronics is designed for a current of 5 volts. Use less voltage is not able to provide efficient charging battery, but more current can cause instant the output of their power controller.

Features of choosing an external battery for a smartphone by the presence of additional options

Charging a smartphone’s battery is far from the only a function that modern power banks can provide. IN For sale there are devices with:

  1. Built-in flashlight;

  2. MP-3 – player, FM transmitter and built-in radio;

  3. Flash drive with a capacity of 18 to 256 gigabytes;

  4. Moisture-resistant and shockproof housing;

  5. The above features are a nice addition, and if consider power bank from the position of the primary function, primary The value is provided by the capacity of the built-in battery, power output current and charging methods.

In the following articles, our experts tell you how to choose iphone battery and secrets of choosing battery capacity.

Attention! This material is subjective opinion of the authors of the project and is not a buying guide.

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