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How Does a Power Bank Work? A Beginner's Guide

How Does a Power Bank Work? A Beginner's Guide

In today's world, electronic devices have become an integral part of our lives, whether it's our smartphones, tablets, laptops, or other portable gadgets. But what happens when the battery of our device runs out of juice while we are on the go, away from a power outlet? That's where a power bank comes in handy.

A power bank, or a portable phone charger, is a portable device that stores electrical energy and can be used to recharge electronic devices like smartphones, tablets, and laptops on the go. But how do portable phone chargers work? In this guide, we will explore how a power bank functions to provide us with an uninterrupted power supply when we need it the most.

how power bank works

What is a Power Bank and How does it Work?

A power bank is a portable device that typically consists of a battery, input and output ports, and a control circuit that regulates the flow of electricity. What is a power bank used for? Basically, a power bank serves as an external battery for cell phones, tablets and so on, which can power up your devices in case they are running out of juice.

Since a power bank is in essence a battery pack to charge cell phone, you may still wonder or “How do you charge a power bank” and “How to use a power bank after charging it fully”. To charge and use a power bank, you simply charge it up by plugging it into an electrical outlet, and then connect your electronic device to the power bank via a USB cable after charging of the power bank is done. Once connected, the power bank transfers its stored electrical energy to your device, recharging its battery and keeping it powered up even when you are away from a wall socket or other power source.

Advantages and Disadvantages of a Portable Phone Charger

Portable phone chargers are a simple answer to any case in which your cell phone runs out of power and you have a long distance to travel before reaching a charger. However, there are advantages and disadvantages that you must take note of before enjoying fully the benefits of such a gadget.

Advantages of using a Phone Charger

  • Enables on-the-go charging.
  • Comes in a range of sizes and designs.
  • Can charge multiple devices simultaneously.

Disadvantages of using a Phone Charger

  • Needs a power source to recharge (such as a wall outlet or USB port).
  • The charging speed varies based on the charger and the device.
  • May be big or heavy to transport.
  • Poor-quality chargers may cause device damage or pose a safety risk.
  • Some chargers may not work with specific devices.

How Many Times Can a Power Bank Charge My Phone?

The number of times a power bank can charge your phone is determined by various factors, including the power bank's capacity and the battery capacity of your phone. To calculate the approximate number of charges, you must first know the capacity of both the power bank and the battery in your phone. For example, if you have a 10,000mAh power bank and your phone's battery capacity is 2,500mAh, you can anticipate the power bank to last roughly four full charges before it has to be refilled.

As a rule of thumb, a good quality power bank should be able to charge most phones for at least two to three full charges, but it is always a good idea to verify the specifications of the power bank and your phone to obtain a more precise estimate.

Different Types of Power Bank

Here is a detailed list of the many different types of power banks customers may encounter.

Standard power banks

These power banks are small, lightweight chargers with a capacity typically less than 20000 mAh. They are easy to carry and perfect for the day-to-day charging of mobile phones and other small devices. In fact, this is what most people refer to when they simply say “power bank” in our daily lives.

Solar power banks

An ingenious gadget, this kind of power banks gracefully blends solar energy into its working mechanisms. Solar power banks come with built-in solar panels that allow them to recharge using sunlight. They are a great option for outdoor enthusiasts and can be useful during power outages.

Laptop power banks

These power banks are specifically designed for charging laptops. They are usually distinguished by their high capacity and wattage while having a relatively compact size.

Wireless power banks

With the advancement of technology, wireless is the way to go. This kind of power bank enables wireless and hassle-free charging on the go, which is ideal for people who detest clutters.

You can choose the best power bank to match your demands and ensure that your gadgets are always charged and ready to use by taking into account these different types of power banks.

How to Choose the Right Portable Charger?

With so many portable chargers and power banks on the market, it might be difficult to choose the best one. Here are some points in choosing a power bank.

  • Output

As an essential criterion, the output of a power bank can determine the compatibility with your device as well as the charging speed. Check the output of the power bank and the requirements of your devices thoroughly before choosing a power bank.

  • Portability

Consider the size and weight of the power bank. Look for a power bank that's easy to carry around with you, especially if you'll be using it on-the-go.

  • Durability

Look for a power bank that's built to last. Consider factors like the material it's made from and whether it's water-resistant.

  • Price

Finally, consider the price of the power bank. While you don't want to overspend, it's important to invest in a quality power bank that will last.

How to Conserve the Power Pack's Life?

If you want to conserve the life of a power bank, here are some tips that you can follow:

  • Store the power bank in a cool and dry placewhen not in use.
  • Don’t overcharge the power bank.
  • Charge the power bank regularly.
  • Use the power bank only when necessary.
  • Use the power bank's original cable.

By following these tips, you can help conserve the life of your power bank, ensuring that it lasts for a long time and provides you with the power you need, whenever you need it.


In conclusion, power banks have become an essential gadget in our daily lives. They provide a convenient and portable solution for keeping our electronic devices charged while we are on the go. Understanding how a power bank works can help you make an informed decision when choosing the right power bank for your needs. By considering factors such as capacity, output rating, durability, and price, you can select a power bank that meets your charging needs while ensuring the safety and efficiency of your device. With a reliable power bank by your side, you can stay connected and powered up wherever you go.


Should I Fully Drain My Power Bank Before Charging?

No, you do not need to fully drain your power bank before charging it. In fact, entirely draining the power bank is not recommended because it can damage the battery and shorten its overall life. You can charge it at any time, but it is best to charge it before it is fully depleted to help extend the battery's life.

Are Power Banks Allowed on Planes?

Yes, power banks are normally permitted on planes; however, there are some restrictions to be aware of, depending on the airline and nation to which you are traveling. It is generally a good idea to check with your airline before you fly to ensure that every restriction is obeyed.

Which Power Bank is Best?

The best power bank for you will depend on your specific needs and preferences. Factors to consider when choosing a power bank include capacity, portability, charging speed, price, brand, reliability and so on. This said, one of the best power bank brands you can expect on the market is Anker. You can check Anker 737 Power Bank that has a capacity of charging your phone for 5 times.

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