The best power bank in 2021

Back-up batteries have nowadays become very practical due to our multiple trips outside the home. It is used to improve the autonomy of our smartphones, tablets and laptops. The use of recharging batteries has therefore become essential to use these smartphones for longer, which only last one day (especially if you are on the move or outside). Even if manufacturers do their best to improve the endurance of their flagship, the most resistant are unable to last more than 48 hours.

To stay reachable, many people turned to the best power bank available on the market. However, because of its versatility and diversity, knowing which external battery to choose can be a real headache. If you are looking for an external charger, an external battery comparison is the perfect solution to know certain aspects to take into account in order to avoid drowning in the multitude of offers present.

Indeed, when looking for an external battery for iPhone or Samsung for example, many criteria can come into play. To help you make the best possible choice, we offer you a comparison of the best external chargers for phone that you absolutely necessary in 2020.

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Our comparison takes into account a multitude of aspects to offer you the battery that best suits your needs.

Operation of an external battery

It is easy to learn. To use it, you just have to take the time to recharge it via an electrical outlet or solar energy in the case of solar batteries. Use an adapter to recharge the battery. Several incorporate LEDs, which flash to indicate that the charge is in progress. It stops once charging is complete.

The charging time may vary depending on the brand. Standard external batteries take 4 to 5 hours to recharge. The tests on the external battery fast charging against by requiring less than two hours. This is why the discharge speed of the power bank will always be faster if it is a quick charge external battery .

To charge, just use a USB cable to connect the smartphone to the battery. To show the level of energy available on the battery, one or more LEDs flash. The LEDs are supposed to blink from the first to the fourth. To find out how much energy is left, take the time to observe how the LEDs behave. Even if the shapes, capacities, masses and sizes of external batteries differ, LEDs will allow you to have an idea of the level of energy remaining.

When the fourth LED only flashes, the percentage of remaining energy is between 100 and 75%, the flashing of the third LED symbolizes a remaining energy estimated at 75 and 50% of available energy. If it is the second LED, it remains between 50 and 25% of energy finally, the blinking of the first LED means less than 25% of energy. To avoid running out of energy, you must recharge your backup battery as soon as you return before reaching a critical energy threshold.

The different types of back-up batteries

To know which external batteries to choose, it is important to know the different types on the market. Each type of battery has its advantages and disadvantages. You must therefore take them into consideration when making your choice.

External batteries

The battery is a portable current accumulator that can be made of lithium or polymer. It is versatile, as it can charge all devices of 5 volts and more. It will therefore support cell phones, touch tablets and many other mobile devices.

It is simple to use, just charge the battery to use it when the autonomy of your smartphone is low. It is also a real trendy accessory that offers various shapes and colors. There are also external computer batteries , very practical for improving the autonomy of your PC, especially if you are a real “nomad”. You can also afford to use the smartphone while charging on the battery.

Wireless chargers or external induction batteries

The wireless charger or induction battery allows you to power the battery of your smartphone without having to go through a USB cable. It works without a physical connection between the charger and the device. To do this, you simply need to place it on the wireless charger. It does not have a battery, but rather incorporates a coil. It is a metal coil which sets up a magnetic field which is linked to a device to be recharged.

To work, the phone must have compatible wireless technology. Magnetic induction therefore allows this induction charger to emit an energy of 5 W. This type of battery generally incorporates Qi magnetic induction technology to cause an electromagnetic field, which allows the device to be recharged nearby.

Solar batteries

The solar batteries are a perfect solution to charge devices when you are in an area where there is no electricity. It is often used to charge smartphones, GPS, computers and music players and offers real savings in terms of energy expenditure. To operate, it incorporates a solar charger that captures the sun’s photons to conserve energy, which will be returned to your device when recharging.

Battery cases

Why bother with an external battery when you can directly incorporate a battery case, also called a rechargeable case, on your phone? This will make it a trendy tool and at the same time change the look of your device.

A true revolution in the hulls Samsung batteries and iPhone are prized by fans. They can thus increase the duration of use of the smartphone during the day. The battery cases come in different models, you must make sure that it fits perfectly to the model of your phone.

They have a battery that lights up to transmit its energy to the main battery of the smartphone. Other models are closer to external chargers. To transmit energy, a connector serves as a link between the shell and the phone. This type of battery is perfect, because it is almost impossible to forget it.

Buy your external battery (choose the right backup charger)

Before you can control an external battery , start by asking yourself what external battery choose . This should perfectly meet your needs in terms of budget and functionality. Many criteria are to be considered:

Compatibility with your Smartphone

It is important before buying an external battery , to be reassured that the choice made will work perfectly with your smartphone. To do this, make sure that your flagship is compatible with the technology offered. Whether it’s a wireless charger or a quick charge power bank , make the right choice so that you don’t invest for nothing.

The price of the external battery

The prices of phone batteries are quite wide and vary depending on the criteria. The most affordable prices range from 10 to 60 $, but external PC batteries can cost as much as 150 $ for some models. We have noticed that the external battery reviews show that the best external chargers 2020 have built- in LEDs to show the charge level. The price may also vary depending on the design and different options integrated into the phone.

Also note that the prices of external batteries differ when it is a lithium battery or a lithium-ion battery.

The capacity or intensity of the battery (in mAh)

It is important to note that the capacity and charging intensity of a battery should be taken into account before purchasing an external battery. To do this, the energy of the battery and that of the external accumulator must be taken into account. Indeed, the tests on the external battery show that part of the energy is lost during the transfer of the latter.

It is therefore important to take into account the energy loss that takes place when converting the voltage from the battery to the USB cable. Indeed, the voltage must go from 3.7 Volts to 5 Volts, the mobile device transforms these 5 Volts into 3.7 Volts.

Our comparison of the best external batteries shows that on average 20% of the energy capacity is lost during this phase. So make sure before buying an external battery that its capacity is twice that of the smartphone.

To illustrate with a full external battery :

  • 10,000 mAh of which 20% is lost; which gives 8000 mAh
  • Capacity of the internal battery of an empty Samsung Galaxy S9 Plus: 3500 mAh
  • Number of charges: 8000mAh / 3500mAh = up to 2.28 times

This means that with a 10,000mAh power bank, you can charge your Galaxy S9 + empty battery up to 2.28 times .

The charging time and the number of recharges

These two elements of the battery charger are important for gaining charging performance. The number of times an external battery can be recharged is the number of times a battery can charge your device. As illustrated above, a 10,000 mAh battery will be able to charge a Galaxy S9 plus 2.28 times whose internal battery has a capacity of 3,500 mAh.

Charging time differs from the batteries you buy. Certain technologies are available and allow either to increase the speed of charge transfer. This is why you should give preference to external chargers that offer Quick Charge fast charging technology.

Battery reliability: a matter of safety

A power bank whether it has a solar charger or a Lithium-ion battery is far from being a harmless accessory. These batteries can ignite and explode if they overheat abnormally. The risks increase when the battery has been poorly designed and does not meet the standards set by the EU. To reassure you, check that your tablet and smartphone battery has the CE logo. When purchasing, choose a branded battery (Aukey, Anker, RAVPower, Samsung, Xiaomi, POWERADD…).

Fast charge technology or QuickCharge

A Quick Charge external battery is advantageous because it reduces the charging time. Some third generation versions even go as far as recharging from 0 to 70% of 3300 mAh in 30 minutes!

This allows you to quickly recharge an external battery without wasting time and quickly recharge your phone. An excellent positive point if you are someone in a hurry. However, not all smartphones are compatible with this technology.

The other functionalities

Our top 10 external batteries 2020 was made according to your needs and the criteria mentioned above. However, you can also choose a spare battery with flashlight or a compass, essential for campers. For high-tech fans, batteries with LCD display indicating the charge level.

The size and weight are also to be considered to fit either in a pocket or in a small purse. On the other hand, some solar portable chargers of 20,000 mAh for example will not be able to fit in a pocket.

Benefits of using an external battery

Back-up batteries, once properly chosen, are real assets. They allow you to have greater autonomy in terms of energy even in intensive use of your phone. Depending on the type of power bank chosen, it is possible to move and use them easily.

A security aspect is also to be taken into account. Since the power bank is not permanently connected to a source of electricity, the risk of accidents is reduced. Versatile, the external battery reviews on Amazon will be of great help in choosing the right external charger. In addition, the best external batteries save time. No more waiting for hours for the phone to charge before going out.

Is it allowed to take your external battery on board an airplane?

This is a question that many users ask themselves. And for good reason, the back-up battery accompanies us everywhere. However, the only way to travel with this equipment on an airplane is to put it in your hand luggage.

Information provided by the International Air Transport Association (IATA) relating to the Regulation of dangerous goods shows that the external battery is assimilated to a spare battery . It is forbidden to place it in the baggage going in the hold, but it is possible to take it in the baggage or handbag. However, it must have a capacity of less than 100 Wh (Watt-hour).

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