Power Bank: What is a Power Bank? Why is it needed? How to choose?


An external battery is an indispensable device when traveling, as well as going to school or work. It can be useful not only for teenagers, but also for their parents. We will tell you about what Power Bank is. Consider why you need it. And how to choose a device.

Why is Power Bank needed? What is he like?

Power Bank is a portable battery. A charging station to which your phone can be connected even outside the home. And it will charge quickly. Moreover, for an unlimited number of percent. From scratch to full battery charge.

We will not talk about the technical aspects of the internal structure of the Power Bank. Let’s just say that a portable charger can have one or more USB slots. You can insert a cord from a smartphone into them. And connect the phone itself. So that he is filled with energy.

Also, the portable charger can be recharged. To do this, it must be connected to an outlet. To do this, you can use a power adapter and a USB cable.

How to determine how many smartphone recharges a particular device can do?

When people choose a Power Bank for themselves, they look at two parameters. The battery capacity of the portable battery itself (for example, it can be 10.000 mAh or 20.000 mAh). And then they look at the characteristics of their phone on the Internet. In particular, the capacity of your battery. Suppose a person’s phone has a 2,500 mAh battery.

After that, it divides the capacity of the external battery, for example 20,000 mAh, by the size of the battery on the smartphone (2,500 mAh). Receives the number 8. And thinks that so many times he will be able to recharge the phone from a fully charged Power Bank.

However, these are not entirely correct calculations. For several reasons.

Why can’t you divide the volume of a Power Bank by the characteristics of a smartphone battery in order to calculate the number of potential charges?

Determining how many times you can charge the phone by the volume of the external battery can only be approximately. A 20,000 mAh Power Bank cannot charge a smartphone with a 2,500 mAh battery eight times because:

This will not allow the design of the device. The Power Bank has a special battery voltage inside it. This figure is 3.7 volts. At the same time, these voltage indicators are not enough to maintain the performance of the Power Bank. It should be kept at 5V. To increase the rate, the device uses a specialized controller. When it functions, it draws energy from the Power Bank. Accordingly, the capacity of 20,000 mAh is already getting a little less.

When a teenager connects a phone to an external battery, he does it through a cord. Some of the energy is lost during the transfer of charging from the Power Bank to the smartphone.

The external battery is gradually discharged. Its capacity (the number of mAh) is gradually becoming smaller. This happens if the external battery has been used for several years in a row.

When buying a Power Bank, keep in mind that its actual capacity may be 20% less than the declared one. For example, when choosing a device with a 10.000 mAh battery, be prepared to only have 8.000 mAh at your disposal. If you choose a Power Bank with 20,000 mAh, then, accordingly, only 16,000 mAh.

How much Power Bank should you choose?

The next aspect to consider when choosing a Power Bank is its volume. That is, the number of mAh. The value of this indicator is deciphered as milliampere hours.

There are Power Banks of absolutely any capacity. Both those with a 5.000 mAh battery and 10.000 mAh, 20.000 mAh. It must be remembered that, depending on the volume of portable charging, its size and size become larger. And also the mass. Consider this aspect when buying a portable charger.

Choose the volumes of the external battery depending on your goals. If your family needs a Power Bank on a trip, then take the 20,000 mAh model. It will be needed so that everyone can charge the smartphone at least once. Also, when buying a Power Bank for a trip, its size and weight are absolutely not important. Because it will be carried in a travel bag.

If you are buying a portable charger for yourself or a teenager for everyday use, then you can purchase a small charger. The volume of which is 5.000 mAh or 10.000 mAh. Such a charger will be enough for the smartphone to be charged at least once.

Charging current

Pay special attention to the parameter called charging current. It directly depends on how fast the smartphone will be charged from the device. The charging current can range from 0.5 to 2 amperes. Where 0.5 is the slowest speed. And 2 is the fastest. With the latter, respectively, the phone is charged in the shortest possible time.

Most Power Banks have two connectors for charging devices. One of them charges the smartphone at a speed of 1 amp. And the second – at a speed of 2 amperes.

Choose a Power Bank that charges as quickly as it charges your devices

A portable charger should charge as quickly as it charges the device itself. It must provide its own battery with sufficient current when charging. So that you can quickly charge the Power Bank for both 10.000 mAh and 20.000 mAh. And so that you do not have to wait 24 hours until the external battery is fully charged. And sometimes more time.

Charging connector

The next aspect to consider when buying a portable charger is the mains connector. It is desirable that it be made in MicroUSB format. In this case, the portable battery can be charged in any way. Both from the outlet and using a computer.

Charge indicators

Pay attention to which system is used to indicate the information about the state of charge of the device. When buying a cheap Power Bank, this information will be indicated using traditional LEDs. If you purchase an expensive model, then the data will be indicated on special LCD indicators. It is much easier and more convenient to read information with the help of them.

Body material

Power Banks can have a body that is made of:

Regardless of what material the portable charger has in its structure, it will work equally well. However, metal products are less likely to deform. When dropped to the ground, they continue to function. But the likelihood of damaging a plastic device is much higher.

Additional devices in portable charging

Some particularly expensive models of portable chargers may have useful additional features. For example:

  • An ordinary flashlight. Or LED backlight.
  • The ability to connect to the Internet. And sometimes even use a portable charger like a Wi-Fi router.
  • The ability to read data from a memory card.
  • The ability to use Power Bank as a USB flash drive.
  • Built-in clock that has an alarm function.
  • Special generator of electricity.
  • And much more.

What aspects to look for when choosing an external battery?

When choosing an external battery for your teenager, pay attention to the following aspects:

The main emphasis when choosing a portable charging should be on its volume. On how many mAh the device offers. The higher the indicator, the better portable charging. The rest of the parameters are secondary.

For long-distance roads, purchase the largest possible Power Banks. Those that have a size of 20,000 mAh. If you are going on a very, very long journey, where there will be no outlets at all, we recommend purchasing a more advanced version of the portable charger. Which offers the opportunity to replenish energy through alternative sources. For example, the model that has a special solar battery in its structure. Or one that can be charged through the cigarette lighter located in the car. Such a portable device would be very convenient to use.

If you need a portable charger so that a teenager can recharge a smartphone just once a day, buying expensive Power Banks is not enough. You can only buy a portable charger with 5.000 mAh. This will be enough to keep your smartphone charged.