Best Powerbank – a guide to buying the right model

If you don’t have a power bank battery, you will probably need it at some point. Mobile phones are becoming more advanced and therefore consume more energy. So the question is, which power bank to choose, and which will be able to cover all your needs? This blog will do our best to answer all your dilemmas regarding the external battery.

The questions to ask yourself before buying are the following:

• Which device do I need a power bank for – mobile, tablet, laptop, e-book reader?
• Will I charge multiple devices at once?
• How often will I charge them?

Once you answer these questions, you can decide what kind of external battery you need. Here are some things to keep in mind when you finally decide which power bank to buy:


To choose the suitable capacity of the external battery, it is best to multiply the power of your device two or better three times. The result obtained is your starting point for selecting the external battery’s capacity. The external battery’s capacity is expressed in milliamperes (mAh), in the range of 1000 mAh and even over 15,000 and more.
For example, if you have a 3500 mAh phone, you need to know that between 70 and 90% of the power bank’s capacity is usable. This is because each power bank loses some of its energy during charging, so it is advisable to take an external battery that is larger than the capacity of your phone. It is recommended that the power bank has enough ability to charge your device at least once. You will calculate this capacity if you increase the capacity of your device by 20%.

How to choose a suitable capacity?

Well, this already depends on your needs. If you go on trips and think that you will not be able to charge your phone often, then you need an external battery with a higher capacity. On the other hand, if you only need to recharge your phone during the day, even the one with minimal power will meet your needs.

According to capacity, power bank batteries are divided into:

1. External batteries of the lower category (up to 2000 mAh) – the cheapest batteries, smaller in size, and mainly serve as a complement to the phone because they can not charge larger devices due to low capacity.

2. External batteries of a medium category (up to 6000 mAh) – they can quickly charge the mobile phone at least twice and charge the tablet. Some external batteries of this capacity can have more than one USB port and charge multiple devices. In terms of dimensions, storms of this capacity are slightly larger than the previous ones, but not too much.

3. High category external batteries (up to 10000 mAh and more) – are among the most expensive power bank batteries, but you can charge any device several times. They are not so practical for size and weight, so you should keep that in mind when deciding to buy them. Take special care if you travel by plane as some airlines limit the intake of high-capacity power bank batteries.

How important is the size?

The answer is straightforward if you want to have a power bank that you will constantly carry with you, then be sure to buy some more miniature in size and weight. However, it would be best to keep in mind that it is not easy to match the needs with the size because smaller models have a smaller capacity. So you need to take care of that and try to find a compromise between size and power.

Charging speed

To find out the charging speed of the power bank you want to buy, you need to check the output current capacity. It is a label printed on the device and is expressed in amperes (A brand). Most models have 1A (5W), while those that support fast charging are marked 2A (10W) or higher.
If you have a power bank device that supports fast charging, you also need to have a phone that supports it. If you connect a phone that supports fast charging to a power bank that does not help it, it will charge slower and vice versa. That is why it is always necessary to check what output current your device needs.
It is advisable to pay attention to how fast the power bank is charging. Lower capacity external batteries charge faster and vice versa. Charge the power bank with the cable in the wall socket or the USB cable via the laptop. However, in the second case, the external battery charges much slower. 

Additional features

In addition to the basic ones, Powerbank has some additional functions such as:
Smart charging – the power bank detects when you have connected a charger to it and starts charging it automatically.
You are charging with solar energy – a great addition for camping and travel where you do not have the opportunity to set an external battery often. What is essential is to consider how long you leave the power bank in the sun if you have this model. Staying in the sun for too long can speed up solar energy consumption.
Charging multiple devices at once is an excellent option if you want to charge your phone, tablet, or even more devices. With these models, one input has a higher output current than the other.


Display devices show how much battery is left in the external battery. Such models are a bit more expensive, so a good alternative is a power bank with an LED light that shows when the power bank is charged and when it is empty.

Storing an external battery

Powerbank has a Li-Ion battery, so it is very similar to the batteries in smartphones, and the same rules apply to it. You must not expose the external battery to higher temperatures and do not allow your device’s battery to run out entirely before you connect it to the power bank. Try to keep the device at least 40%.
How much energy does the power bank retain when you are not using it?
This depends on the model, more precisely on their parts and the quality of the battery cell. With good models, the energy can stay in the power bank for six months with a minimal loss. For lower quality models, up to a month, a month and a half. This is also affected by temperature.

Choose a power bank with one or more connectors?

This should be according to your needs. As we have already mentioned, with a power bank with two or more connectors, one has a higher output current than the other. So it is best if you want to charge two devices to buy a model that has at least 2.1 A at one output and at least 1.2 A at the other. To avoid damaging the circuit, you also need to match the output current to your devices.
It is best to buy an external battery that can charge more devices and yourself, but you will have to spend more money for such models.

Quality and safety of an external battery

Although most external batteries are made in China, this does not mean that they are all of the poor quality. In essence, all functions are more or less negligible in terms of quality. If you choose a terrible power bank, your charging device may malfunction. It is essential always to be well informed before buying and selecting proven models with certificates. Never fall for models with meager prices and high capacity or advanced features. Because you will never get the power, they guarantee.

External batteries have a built-in security chip that interrupts charging when the device is charged. If you want more security, buy a model with printed circuit boards because it protects the device from overheating and short circuits. With these models, there is also the option of recognizing the type of device so that the external battery delivers the optimal amount of energy when it identifies the device.You will find a large selection of power bank batteries of various sizes and qualities on Amazon. We hope this text will help you choose the model that suits your needs.