What is a Power Bank? - Everything You Need to Know

charge phone with portable power bank

If you are using electronic devices, you are likely running out of battery at least once per day. To make your batteries last longer or to recharge your phone while on the move you might have thought of getting a power bank, but what is a power bank exactly?

What do you use for power if there are no outlets to plug into? How do you plan to continue using the device you currently have charged? The answer to that query is an increasingly well-liked sector of the economy known as portable power, more specifically, portable power banks.

You need to be equipped with a dependable source of backup power that is portable and easy to carry if you want your devices to stay charged. These power banks vary in size and capacity, from larger ones that can charge your laptop to smaller pocket-size banks that are handy to have in your car or your purse if you need to recharge your phone on the go.

What Is a Power Bank - A Definition

Portable batteries, also referred to as power banks, are used to regulate power in and out. Most of them are charged via USB, the same as you would use to charge your phone. Once fully charged, you can then use the power bank to charge your devices such as a phone, tablet, or laptop, depending on the capacity of the power bank.

How Does a Power Bank Work?

Power banks function similarly to any other rechargeable battery because they are just conventional batteries with a few added functions. Here’s how we can simply explain what a power bank is and how it works: when linked to another device that requires charging, the bank passes the energy that it has stored to the device in need. Fully charged device at the ready.

Of course, they can be very complicated machines in terms of electronics. Power banks have functions in addition to charging and recharging, such as power indications, safety features, and speedy charging methods.

What Types of Power Banks are Available?

Once you understand the answer to the question, what is a power bank, you might ask yourself what types of power banks exist. There are several different power bank portable charger models available for purchase. Various other categories might be taken into consideration, however, size is undoubtedly one of the key factors. Here are the most common varieties of power banks:

Universal Power Bank

A universal power bank is the typical power bank that may be purchased in most shops. They are recharged using standard USB chargers. The power in connection is typically a micro USB connector although this does vary by device and many have multiple input options. Often they look nice and small and have a light indicator that shows you if the power bank is charged and how much power it has remaining.

Solar Power Bank

As their name suggests, solar power banks may be charged by the sun. They have small photovoltaic panels for this purpose, the same technology that is used for home solar panels. Because these solar panel cells are very small it must be sunny for them to be fully charged in a reasonable amount of time. Make sure you position this power bank towards the sun to maximize charging time.

If you buy a solar power bank, it’s best to purchase one that comes with another input source so that you can use it even if there is no or limited sun. When you are on the move and are not near a source of electrical power, solar charging is a helpful backup. Also it is recommended to have a power bank with more than one output option so that you can not only charge your phone but your laptop and other digital devices. With BLUETTI EB3A, you can have more than one input source and output option.

Some batteries can take more than a full day to charge, and since it isn't sunny all day or night, it can take a while. If you are thinking of buying a solar power bank, make sure to check capacity, because not all of them are made the same.

what is a portable power bank energy surges

Wireless Charging and Power Bank

Get rid of your cords because wireless charging is now widespread - even when it comes to portable power banks! Many power banks such as some from BLUETTI come with built-in wireless charging pads. That way, you don’t need to worry about finding the right cord, just place your phone or wireless-charging-enabled device on it and you’re ready to go. Usually, these power banks can be charged with a USB cable and then used wirelessly. This is the best option, so make sure you know what you are buying and what features it has.

The Qi standard, which is used by almost all wirelessly charging electrical devices, is also followed by these products. It works very simply, when your power bank is charged you can position the device you wish to charge directly on it and press the button - ta da - power! It will work until the device is fully charged. Just make sure that your device can be charged wirelessly because some older phones do not have this option.

Turn off the power bank when the charging is finished to ensure you are not losing power and that your power bank lasts longer. All power banks have a certain number of charging cycles (usually in the hundreds) so they should be used wisely.

How Long Can a Power Bank Last Before You Need to Replace It?

If you are wondering what is a power bank you might be asking yourself if it is worth it and how long they last. When it comes to power banks the main reason to buy them is the ability to feel comfortable when you are not able to charge your devices, so affordability comes in second.

All portable batteries lose power after a certain number of charge-discharge cycles. A battery's lifespan can be shortened if you are not using it correctly and if you are wasting energy, and in the end, it will be less effective until it completely dies. Some less expensive power banks may only last a few hundred cycles, whereas superior power banks will last many more.

All portable battery devices undergo some degree of self-discharge over time. These days, rechargeable batteries include their management circuitry, and maintaining these circuits requires a little amount of electricity. A battery can only be charged for a certain amount of time as a result.

A high-quality power bank can stay charged (without being used) for a couple of months with only a slight loss of power, whereas a lower-quality one might only do so for approximately a month before it needs to be topped up. Where you store them means a lot, because their best performance is expected at room temperature.

How Frequently Can I Charge My Device With a Power Bank?

This depends on the power bank's or portable charger's capacity and your device. The capacity of a power bank is measured in milliamperes (mAh). In general, your power bank or portable charger will have more power to recharge your devices if it has a greater mAh rating.

As a general rule, check the mAh rating of the devices you wish to charge and get a power bank with a matching rating. Most pocket-size power banks that are available today will charge your phone at least once if not more before needing to be recharged.

Are a Portable Charger and a Power Bank the Same Thing?

Portable chargers and portable power banks are essentially the same things. The same sort of equipment is referred to by a variety of names, including a power bank, portable charger, portable phone charger, external battery, external battery pack, etc. A power bank is a battery that you may use to charge a gadget on the go without plugging it into a wall outlet.

What Is a Power Bank Battery Technology? - Quick Explanation.

Although Lithium-Polymer and Lithium-Ion batteries are most frequently used in power banks, additional types may soon start to appear on the market, as the planet is trying to stay away from Lithium altogether. There will probably be some spin-offs into power banks because battery technology is essential for the industry at the moment.

It is a balance between price and performance, yet both power bank types function effectively. The two currently in use technologies have two minor differences in characteristics:


Lithium-Polymer batteries used in power banks are a better option because they age less quickly than Lithium-Ion batteries. However, because of their higher manufacturing costs, they might not be suitable for everyone’s budget. If you lose things easily when travelling or camping, this might not be a good option for you because they can be very costly to replace.


This is a more affordable and widely used option. Lithium-Ion batteries can hold more charge compared to Lithium-Polymer batteries and have a better energy density, but they can also experience problems as they age. However, they are easily replaceable, so if you lose them or they die, you won’t be quite as upset.

How Can You Make Your Power Bank Last Longer?

You may extend the life of a power bank by making sure to choose a dependable, large-capacity battery pack since after a power bank has used up all of its charging cycles, it must be discarded. Power banks have an average of 300 to 500 charging cycles, equivalent to cell phone batteries.

Here are a few tips on how to have your power banks last longer:

  • Be careful not to drop it. Some components it contains are very sensitive, like a circuit board, battery, etc.
  • Charge your power bank every time that you are not using it. They age noticeably slower if there is some power in them when they are not used.
  • Do not use it in extreme temperatures because it can drain the battery faster. The optimal usage of your power bank is if the temperature is between 5 and 25 degrees.

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