Which power bank is right for me? How to find the right model

However, the choice has become increasingly broad. 5,000 or 20,000 mAh, 20W or 140W charging power, integrated cables, multiple ports or magnetic charging. But which of these specifications really matter in everyday use?

We take a closer look at what to consider when choosing a power bank and which current models from Anker, Xtorm and Samsung are worth considering for different needs.

A power bank’s capacity is measured in milliamp hours. In principle, the higher the value, the more energy the power bank can store. However, the highest number is not automatically the best choice.

Someone who mainly needs an emergency backup for a smartphone has very different requirements from someone who wants to charge a smartphone, tablet and laptop while travelling for business. As capacity increases, size and weight usually increase as well.

It is also important to remember that the stated capacity does not reach the connected device on a one to one basis. Energy is lost during conversion and transfer. For its Nano Power Bank with 10,000 mAh, for example, Anker states an actual usable capacity of around 5,500 to 6,500 mAh.

Capacity is therefore a good starting point. Only when combined with charging power, design and features does it become clear whether a power bank really suits your needs.

Anyone looking for a compact emergency backup should take a closer look at the 5,000 mAh category.

The Xtorm Go2 PowerShot 5K follows a particularly straightforward approach. It weighs just 101 grams and features a fold out USB C connector delivering up to 20W. This allows a smartphone or other compatible device to be connected directly to the power bank without requiring an additional cable.

For commuting, a day trip or a long event, this can be exactly what is needed. The power bank takes up very little space and provides additional energy whenever the smartphone battery starts running low.

The Anker Nano Power Bank 5K Magnetic Slim takes a different approach. It also offers 5,000 mAh, but attaches magnetically to a compatible smartphone. Anker uses Qi2 with up to 15W wireless charging, while USB C delivers up to 20W. At just 0.76 cm thick, it remains exceptionally slim.

These two models already show how different two power banks with the same capacity can be. Xtorm focuses on straightforward USB C charging, while Anker puts greater emphasis on the convenience of magnetic wireless charging.

For many users, the 10,000 mAh category is likely to be particularly interesting. It offers significantly more reserve than a compact 5,000 mAh model while remaining portable enough for everyday use.

The new Xtorm NextGen Power Bank 10K with 35W offers 10,000 mAh and up to 35W via USB C. Two USB C ports and one USB A port allow several devices to be charged at the same time. A Smart Display provides current charging information. Xtorm specifies a weight of 212 grams and also marks the model as suitable for air travel.

The Anker Nano Power Bank 10K with 45W focuses even more strongly on convenience. A retractable USB C cable is already integrated into the unit. It also features a Smart Display and delivers up to 45W output. The power bank itself can be recharged at up to 30W.

Details like these can often make a bigger difference in everyday life than a few additional watts. With the cable already integrated, the power bank can simply be packed and is ready to use immediately.

[IMAGE: Xtorm NextGen 10K and Anker Nano 10K]

Not everyone wants a cable running between their smartphone and power bank while charging. Magnetic charging is therefore an attractive alternative, particularly for compatible iPhones.

The Anker MagGo Power Bank 10K Slim combines 10,000 mAh with Qi2 and up to 15W wireless charging. Those who prefer charging by cable can use up to 30W via USB C. Despite its capacity, the power bank remains relatively slim at 1.47 cm thick.

The main advantage is convenience. The power bank sits directly on the back of the smartphone, eliminating the need for a cable between the two devices while charging.

Magnetic charging technology is already moving forward. The Anker MagGo Power Bank 2 Pro represents the next generation and was presented at IFA. The new model is also planned for our range and offers a useful preview of where magnetic power banks are heading.

Capacity remains at 10,000 mAh, but Qi2.2 increases wireless charging power to up to 25W. New features include active cooling with an intelligent fan, a Smart Display and an integrated stand. USB C supports up to 45W.

A direct comparison with the current MagGo Slim shows two different approaches. The Slim focuses on an especially thin design and 15W Qi2 charging. The MagGo 2 Pro puts greater emphasis on charging speed, thermal management and additional functionality.

Anyone who regularly carries several devices or spends longer periods away from a power outlet can benefit from the additional reserve offered by 20,000 mAh.

The Xtorm NextGen Power Bank 20K with 35W continues the concept of the smaller NextGen model. Two USB C ports and USB A allow several devices to be charged simultaneously. The Smart Display provides information about the charging process and, at 346 grams, the model remains relatively portable despite the higher capacity. Xtorm also marks this power bank as suitable for air travel.

The Samsung Power Bank EB P4520 takes a different approach. It also offers 20,000 mAh, but delivers up to 45W and supports Power Delivery 3.0 and Samsung Super Fast Charging 2.0. Its three ports allow up to three devices to be charged simultaneously. According to Samsung, the maximum 45W output is available when charging a single device.

This shows that even with identical capacity, there are important differences. In addition to stored energy, the device ecosystem, required charging speed and available ports can all influence the decision.

As soon as a laptop needs to be charged regularly, USB C output becomes just as important as capacity.

This can be seen particularly well with the two Xtorm NextGen Power Banks with 27,000 mAh. Their capacity is identical, but they follow different approaches when it comes to charging power.

The 70W version offers two USB C ports and USB A, as well as an attached USB C cable that also supports up to 70W. Xtorm lists smartphones, tablets, compact laptops and portable consoles as typical use cases. The power bank weighs 621 grams.

Users with more powerful laptops or other high demand devices can choose the same capacity with 140W UltraCharge+ instead. This model also features two USB C ports, USB A, a Smart Display and an attached USB C cable. Xtorm specifically positions the 140W version for powerful laptops and portable gaming devices.

Xtorm marks both models as suitable for air travel. This becomes increasingly important with larger power banks, because greater capacity does not automatically mean a model can be taken on board without restrictions.

These two 27K models clearly demonstrate why mAh and watts should not be confused. Capacity describes how much energy is available. Output power plays a key role in determining which devices can be charged effectively.

The Anker Power Bank 25K with 165W is also clearly aimed at users who want to charge more than just a smartphone on the go.

With 25,000 mAh, it provides a substantial energy reserve and can charge up to four devices simultaneously. Particularly practical are the two integrated USB C cables. One extends up to 70 cm, while the second is 30 cm long and also doubles as a carrying strap. An additional USB C port and USB A are also available.

Each USB C charging path can provide up to 100W when used individually. When several devices are connected, the power bank distributes the available output between the ports being used. Maximum total output is up to 165W.

This makes it possible to power a mobile setup consisting of a laptop, smartphone and tablet from a single power bank. At around 594 grams, however, it is clear that performance and versatility take priority over an ultra compact format.

Anker states an energy capacity of 90Wh and describes the model as suitable for carry on luggage. Before flying, it is still advisable to check the current requirements of the individual airline.

Not every power bank is designed to disappear into a jacket pocket every morning. For long working days, camping or situations without reliable access to a power outlet, there are models where a large energy reserve is deliberately more important than low weight.

The Xtorm NextGen Power Bank 45K with 70W offers 45,000 mAh and is designed for laptops, tablets and other high performance devices. Two USB C ports and USB A allow several devices to be charged, while an integrated USB C cable is immediately ready for use. A Smart Display provides information about battery level, output and remaining charging time. The power bank weighs 752 grams.

Even more reserve is available with the Xtorm NextGen Power Bank 60K with 100W. With 60,000 mAh and up to 100W USB C output, it is aimed at powerful laptops and complete mobile setups. An integrated USB C cable and Smart Display are again part of the concept. At 953 grams, however, it is clearly a mobile energy source for specific applications rather than a conventional pocket sized power bank.

There is an important difference between this capacity category and smaller models. Xtorm explicitly states that both the 45K and 60K may not be taken on aircraft due to their high capacity.

High wattage figures immediately stand out on a specification sheet. However, the connected device always plays an important role in determining the actual charging speed.

A smartphone will not automatically draw 70W, 100W or 140W simply because a power bank can provide that amount of power. The connected device requests the level of power it supports. Battery level and temperature can also affect charging speed. For its NextGen series, Xtorm explains that output is automatically adjusted to the connected device and its charging status.

A smartphone therefore does not automatically require the most powerful power bank available. Higher output becomes increasingly relevant for tablets, laptops and several high performance devices being charged at the same time.

Just as important are the smaller details that are easy to overlook on a specification sheet. An integrated cable can be more useful on the go than a few extra watts. Anyone with older devices may still appreciate USB A, while users with mostly modern equipment may prefer several USB C ports. Magnetic charging can be the most convenient option when primarily charging a compatible smartphone.

The aim is therefore not to maximise every technical specification. What matters is that those specifications match the way the power bank will actually be used.

Power banks have evolved from simple backup batteries into very different mobile charging solutions. Current models make this particularly clear. Some disappear almost unnoticed into a bag, while others can effectively replace an entire charging station for a smartphone, tablet and laptop.

That is why it is worth looking beyond the biggest number on the packaging. The more important question is how the power bank will actually be used and which features make a genuine difference every day.

Anyone who regularly carries a power bank will quickly notice that convenience can be just as important as raw performance. The right size, the right cable, suitable ports or magnetic charging can ultimately be more valuable than capacity that is rarely needed.

In the end, the best power bank is the one that fits your everyday life so well that it is actually with you when you need it.