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Power Bank Buying Guide

Depending on your needs, you can choose from a variety of power banks. Smaller phones with smaller battery capacities can benefit from some of them. Advancements in battery technology have resulted in smaller, more powerful battery packs.

The battery capacity of the entry-level versions is around 2,600mAh. Most basic phones can be charged once with this. They might be better suited for earbuds and other accessories.

Because most smartphones today have batteries between 3,000 and 5,000 mAh, it makes it logical to buy battery packs with 10,000mAh capacities. In that manner, you can recharge a phone a few times before needing to do so again.

Consider a power bank with a capacity of more than 15,000mAh if you frequently use multiple devices. There are variants that can hold up to 20,000 mAh of power.

Even though power banks may appear to be basic gadgets at first glance, they actually contain several features that purchasers may not know about.

Even a fast 10-minute shopping trip can turn into a paralysis-analysis session that takes several hours to complete. With this buyer’s guide, our goal is to assist the ordinary consumer in finding the best power bank for their specific needs.

What Is a Power Bank Device?

Power bank
Power bank

Power banks are small devices that provide a large amount of power for charging our phones and other devices. This is a portable charger that stores the power in a rechargeable lithium battery.

A battery is the main component of these chargers that makes it portable and easy to use.

These portable chargers can be used to charge various electronic products, such as cell phones, laptops, cameras, GPS systems, USB torches, and other devices.

These power banks are often used to charge the devices while we are on the go.

How does a power bank work?

How does a power bank work

The built-in battery of a power bank is charged by connecting it to an external power source, such as a wall socket, and then stores the energy in chemical form. When electrical energy is required, the battery transmits electrical energy to the connected device through the output port.

The process is divided into three stages: energy absorption, energy storage, and energy release. It performs in a similar way to a cell phone battery, albeit a power bank can be more complicated and have more functions depending on its design and functionality.

Who needs power banks?

  • Power banks are for those who always use the phone too much.
  • Where there is an electricity shortage they should use a power bank.
  • Power banks are used by travelers.

How do I recharge a Power Bank?

How does a power bank work

A charging Diagram for a Power Bank is typically found on Power Banks. A Wall socket adaptor may charge it more quickly than a USB port on your computer.

Using a Power Bank with the same socket as both an input and an output can happen in rare instances, but this shouldn’t be assumed for any Power Bank because trying to force power into an output will destroy the battery.

If you can’t find a clearly labeled input socket, always refer to the manual for detailed instructions.

A Power Bank might take a long time to charge, depending on its capacity and current charge level. A 1500mAh Power Bank should charge in the same amount of time as a regular smartphone.

This time can take too long for major banks. In order to prevent overcharging and overheating, most Power Banks have a safety cut-off and an LED indicator that shows you when it’s full.

Whenever possible, avoid leaving the Power Bank connected for an extended period of time after it has been fully charged. It’s best to keep it filled off on a regular basis because cold temperature and power flow can affect charging times.

What is USB C Do you need it?


USB-C is a newer, faster, and more versatile type of USB connector.

It has a reversible design, so you can plug it in any way you want, and it can transmit data faster than older USB connectors.

It also has a higher power capacity, which means you can charge devices like laptops and tablets more quickly.

So do you need USB-C? The answer is yes, especially if you have a newer device that supports it.



The rectangular port is found on virtually every laptop, hard drive, television, and other electronic devices. Mobile devices, such as smartphones, often use the micro/mini-USB version of the USB connector.

Compact, flippable USB-C


The new, smaller version of USB-A can be used in either orientation. Size and versatility have made it a popular choice for smartphone and laptop manufacturers.

When you place your phone on the power bank, some of the models allow you to wirelessly charge it. In order for this to operate, This will only work if your phone is capable of wireless charging.

Using USB firmware, inputs can be told how much data, power, and speed can be transmitted across the cable. A common feature of power banks is the ability to charge quickly.

Who Has a Need for a Power Bank?

The most common use of power banks is for tablets and smartphones. They’re typically used by people who often have to work away from home or in places where electricity is unavailable, so they need to be able to charge their phones without being tied down.

They’re also used by travelers due to their small size and lightweight, as you’ll never want to lug around a large power adapter with you throughout the day.

There are many brands that make portable power banks. Some of the top brands include Mi, Anker, Energizer, Ambrane, and so on. These brands have different models and each is specialized according to a certain category.

What should I look for when buying a power bank?

Prior to making your final decision on a portable charger, be sure to review the following topics. From top to bottom, we ranked them according to importance in our opinion.


Power bank brand

Even if you have to sacrifice a little bit of battery life, we recommend going with a branded product. There are a number of unknowns, such as charge conversion efficiency, charging time, battery life, corrosion resistance, support for a fast charger, build quality, and so on.

Power bank output DC voltage

Power bank output DC voltage

Consider the charging rate before making a purchase of a power bank. Because of this, the time it takes to charge is longer.

The chargers that come with the device can give you an indication of what is needed. Many small USB gadgets expect half an amp of charge current, phones about an amp, and tablets around 2.5 amps.

Fast charging devices will require additional current, potentially 3 amps. It’s worth noting that more devices have this capacity. Normally, the power banks state their maximum current.

The longer it takes to charge, the lower the maximum current.

Larger power banks have many outputs, which are generally marked on the power bank. A device with several outputs may not be able to supply the maximum current to all of them at the same time.

So buy a power bank with a high output current if you desire fast charging. Don’t worry if your phone or gadget can’t handle the maximum current.

Make sure you’re following the safety warnings.

Safety warnings

When the goods are on sale, we all rushed to buy them without checking the product’s safety warnings.

Check the power bank for safety features like short circuit protection, over-discharging, excessive voltage, heating, and so on before you buy it!

Protect your smartphone with these all-safety features.

A warranty card will also be provided by the firm that provides you with these services, which will guarantee your payment for a year.

Carrying a little powerful device may cause some concern. Even airlines ban portable chargers with excessive battery capacity.

These safeguards assist prevent major safety issues. Over-charge and short-circuit protections are required, with additional protections needed depending on battery capacity.

A safe reset mechanism, reverse connection, and EMF precautions are among the extras available. Is it all? As long as the external battery is properly managed and charged.

Fast charging

site icon
site icon

Two ports on a battery pack usually mean two power outputs. Fast charging is available on the majority of the most recent smartphones, allowing users to get more power out of their devices.

Higher amperage means a faster charge time. The bundled power adapters are typically the best way to use them.  Older battery packs could only charge at 1A.

There are now battery packs available that can charge at speeds ranging from 2A to 3A. When you’re constantly on the go and need to charge your phone quickly, this feature is a godsend.

Chargers that can be used wirelessly

Wireless Power Bank
Wireless Power Bank

Despite its rarity, this will be a useful feature in the future. There have been rumblings that smartphone manufacturers plan to do away with the wired charging port entirely in favor of wireless charging as the next big thing.

Wireless charging is becoming more common on cellphones by a variety of manufacturers. A wireless charger can be used to charge these devices.

When using a power bank, it is possible to charge your smartphone using a wireless charging pad that is attached to the power bank itself.


The capacity of a power bank is crucial. The capacity is often included in the actual name of the power bank, as this is where most people check first. The capacity unit is mAh (milliampere-hour).

Although power banks with capacities as low as 2000mAh are available, most people require more than that, as the average smartphone now has a battery capacity of over 2000mAh.

Because many individuals want at least 2-3 charges from their power bank, it’s easy to see why 10000mAh power banks are popular. 20000mAh and 30000mAh are also common.

However, not all of the power bank’s capacity can be transferred to your phone. Due to charging inefficiencies and other variables, only around 2/3 of the capacity can be used.

Avoid cheap products

It’s best to stay away from things that are too inexpensive because they usually have no warranty and are often fakes. The higher the quality, the more expensive it is to purchase it.

When something costs more, you can rest assured that it is both affordable and dependable. The capacity and speculations should be your primary considerations while purchasing a power bank. It will determine the product’s true value.


When flying with large power banks, keep this in mind. Some airlines are extremely cautious and will only accept a limited quantity and size of lithium-based batteries, including power banks, due to the high power density and problems with a specific type of mobile phone caused by complications with its lithium battery.
As a result, it’s a good idea not to bring too many huge power banks on planes with you. The flight status is also an essential factor in incapacity.
Currently, airlines only accept power banks up to 100Wh or roughly 20000mAh on flights without prior authorization.


Power Bank Ports
Power Bank Ports

A single output port was the norm for early power banks, but as people began to use them more and more, many of the larger power banks now include two or more ports, allowing them to charge several devices at the same time.

Just make sure that each port’s output current capabilities are sufficient.

There may be an overall maximum current output that will be split amongst all outputs if more than one device is charging at the same time, resulting in slower charging times for all devices.

Charge time

Charging or recharging time is another crucial factor to consider when purchasing a new power bank.

Of course, the sooner a power bank can recharge the better. Until recently, a 10000mAh power bank would take 6-8 hours to fully charge. Nowadays, charging times of 2-3 hours are extremely normal.

We’ve compiled a list of the fastest charging power banks. The quickest one, which uses graphene, a newer technology, can be topped up in just 18 minutes.

Fast charging technologies include Power IQ, Power Delivery, and Qualcomm Quick Charge. The fastest charging times require a compatible wall charger.

Most power banks don’t come with a wall charger, so you’ll need to buy one separately. We mentioned the finest, android chargers, GaN chargers, and QC chargers.

Remember that even if you buy a high-speed power bank, the wall charger must offer enough power or be compatible with the charging technology to reach the specified charging times.

Size of a device

Size of a device

When there is no wall outlet accessible and you need to charge your electronic devices on the road, a power bank is a simple and convenient solution.

Because you’ll need to carry the power bank with you, the power bank’s size is critical.

You can put a power bank for your phone or tablet into a purse or wallet, but not a power bank for your laptop or desktop. You can carry a laptop power bank in your luggage or backpack.

Lithium-ion and lithium-polymer

lithium-ion and lithium polymer batteries can be found in power banks. Even while they share many similarities, there are a few tiny distinctions.

Because of their great power density lack of what’s known as the “memory effect,” and substantially cheaper cost, lithium-ion batteries are preferred over lithium-polymer.

When it comes to size and design, lithium-polymer batteries are often more sturdy and flexible, and they tend to live longer. Additionally, they are incredibly light, have a low profile, and have a lesser risk of electrolyte leakage.

Some specs for power banks will indicate whether they are lithium-ion or lithium-polymer, but not all of them will.

In terms of both cost and product value

To get the best power bank for your specific needs, look beyond the images on the website. Look over the features and decide which ones are most important to you before purchasing a power bank.

A cheap power bank may not last as long as you’d like, even if it’s the cheapest option. The overabundance is another reason to pay attention to the price/quality ratio.

Overloading and damaging your electronic equipment can occur with some cheap power banks. All of the given power banks have been thoroughly tested and meet European safety standards.


In addition to the power banks’ capacity, the amperage is critical. Amperage shows you how quickly the power bank charges your gadgets. The amperage of a typical power bank is between 1 and 3.5 A. Faster charging times are achieved by using a power bank with higher amperage.


Which sort of power bank is the most effective?

Even though there are numerous power banks available on the market today, the Mi Power Bank 20,000 power bank, the Coolnut 50,000 mAh Power Bank, and the Moerdon Power Bank 50,000mAh power bank are among the top options available on the market right now.

Which is better 20000mAh or 10,000mAh?

A. The higher the capacity of the power bank, the more power it will provide to your smartphone. Consequently, when comparing the two power banks, a 20,000 mAh power bank is clearly superior because it can provide more charging cycles for your smartphone than a 10,000 mAh power bank.

How many mAh is a good power bank?

How many devices are you charging at once? In general, the more powerful the power bank is, the more expensive it will be. If you’ll only need to charge one or two devices at a time, then a lower-capacity of 10,000 mah battery would sufficient. But if you plan on charging your phone and laptop simultaneously, then a higher capacity of 50,000 is recommended.

Is a 10,000mAh power bank enough?

If you are using a single phone 10,000 mah power bank is enough. That can charge your phone 3 times.