What is a power bank? We will explain it for you!

Written by: R2B Store


Time to read 5 min

In our increasingly connected digital age, the need for continuous energy supply for our devices has become essential. This is where power banks play a crucial role. But what is a power bank? A power bank is a portable device that acts as a mobile battery charger. It allows you to charge electronic devices such as smartphones, tablets, and even laptops without the need for an electrical outlet. This makes it an indispensable gadget for anyone on the go. In this blog post we will explore how power banks work, the different types available, their capabilities, and the benefits of using them.

The Technology Behind Power Banks

How Power Banks Work

Power banks store electrical energy in an internal battery, usually a lithium-ion or lithium-polymer battery, and allow you to use that energy later to charge your devices via USB connection. They are charged with a USB charger and can then release this stored energy to charge other devices. You can charge your favorite devices via the USB ports.

Different Types of Power Banks

  • Lithium-ion : These are cheaper and have a high energy density, but can suffer from aging even when not in use.

  • Lithium polymer : These are lighter and less prone to leaks than lithium-ion, but often more expensive.

Capacity of Powerbanks

The capacity of the portable charger is measured in milliampere hours (mAh). This indicates how much current the power bank can supply before it needs to be recharged. Capacities range from small 2000 mAh models, which are enough to charge a smartphone once, to powerful models of 20,000 mAh or more, which can charge multiple devices multiple times. Make sure you choose a power bank that suits your needs.

Benefits of Using a Power Bank


One of the biggest advantages of a power bank is the ability to charge your devices wherever you are, without having to rely on a wall socket. The mobile charger is especially useful during long travel days, in places without direct access to power, and in situations where you suddenly find yourself with an empty battery.


Power banks are compatible with a wide range of electronic devices. Whether you need your smartphone, tablet, digital camera or even a portable gaming console, a power bank can power multiple types of devices as long as they can be charged via USB.


The ability to charge your devices at any time provides unprecedented convenience, especially during emergencies, long work days away from the office, or during outdoor adventures. With an external battery in your bag you are always prepared and avoid the stress of looking for a charging point. Use the USB port or USB-C port to easily charge your portable devices.

Important Features to Consider When Purchasing a Power Bank


The capacity of a power bank, expressed in milliampere hours (mAh), determines how many charges you can expect for your devices. A higher capacity means that you can charge your phone several times before the power bank itself needs to be charged. Choose a capacity that suits your daily use; a 10,000 mAh power bank is a good all-rounder, while 20,000 mAh or more is ideal for intensive users or longer trips.

Output Specifications

The output specification of a power bank tells you how quickly it can charge your device. This is usually expressed in amperes (A) or watts (W). A higher value means faster charging, which is especially important for devices that support fast charging technology. Check whether the power bank is compatible with your device to make the most of the fast charging functions.

Number of Ports

Using a power bank with multiple output ports can allow you to charge several devices at the same time, which is very useful when you are traveling or using multiple devices. Look for models with at least two ports to offer more flexibility in use, power banks vary considerably in these functionalities so make sure you choose the right power bank.

Size and Weight

The physical size and weight of different power banks are important for portability. A more compact power bank is easier to carry in your pocket or bag, ideal for daily use. Larger, heavier models are more useful for longer trips or for situations where you won't have access to an electrical outlet for extended periods of time.

Additional Features

A power bank is an external battery that functions as a friend for many different mobile devices. The power bank gives your devices extra battery, especially useful if there is no socket nearby. Many power banks come with extras that make them even more useful:

  • Built-in cables : Some models have integrated cables, so you don't have to carry a separate charging cable.

  • LED lights : Useful for indicating the remaining capacity of the power bank or as a flashlight in emergencies.

  • Solar panels : Power banks with solar panels can charge themselves via sunlight, making them ideal for outdoor activities.

This detailed information will help your readers make an informed choice when purchasing a power bank, tailored to their specific needs and lifestyle. So you have read that one power bank is not the same as another power bank.

Which power bank do we recommend?

The power bank we recommend is the 20,000 mAh power bank from R2B. This power bank can be used to charge your phone, camera and laptop, among other things. The power bank is easy to carry and you can also take the power bank on the plane!

The battery percentage of the power bank is easy to read on the display screen. The power bank has a USB in and output and a USB-C in and output, so you can use the power bank for countless devices.

There are different types of power banks available, each with their own unique features and benefits. Below is an overview of the most common types:

  • Standard Power Banks:

    • These are the most common types used for charging smartphones and tablets. They usually range in capacity from around 2000 mAh to 20,000 mAh or more. View the best power banks here.
  • Solar Power Powerbanks:

    • These power banks are equipped with solar panels that make it possible to charge the internal battery with sunlight. They are ideal for outdoor activities where access to a power socket is limited or unavailable. View the best solar power banks here.
  • Wireless Power Banks:

    • Wireless power banks allow users to charge compatible devices without cables. These power banks require the device to be Qi certified for wireless charging. View the best MagSafe power banks here.
  • Compact/Mini Power Banks:

    • These smaller power banks are intended for situations where portability is crucial. They often have a lower capacity, which is enough to fully charge a phone at least once.

Each type of power bank serves a specific purpose or need, depending on the user's situation. When choosing a power bank, it is important to consider its capacity, connection type, size and the specific features you need.

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