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Power bank connected to a smartphone

The best power banks in comparison

Are you often out and about in the great outdoors and looking for the right power bank for your smartphone or flashlight? In this article, you'll find out everything you should consider when buying and how to find your power bank. We show you important aspects such as capacity, charging times and connections. We also introduce you to Ledlenser power banks. These are waterproof and have special features that make them perfect for your next adventure.

What should you look out for when buying a good power bank?

There are a few things you should look out for when choosing a power bank. Power bank test reports emphasize the importance of capacity and charging times.


  • Capacity in mAh
    The capacity of a power bank is measured in milliampere hours (mAh) and indicates how much energy it can store. A higher capacity means that you can charge your devices more often before the power bank itself needs to be recharged. For longer trips or if you want to operate several devices, you should choose a power bank with a higher capacity. However, keep in mind that a higher capacity usually results in heavier and larger devices. Power banks with high capacities can usually be found in the top positions on power bank best lists.

  • Fast charging times
    The charging time is crucial as it determines how quickly the power bank itself can be charged. A power bank with a fast charging time is particularly useful if you have little time and need your power bank to be ready for use again quickly. The Flex5 power bank from Ledlenser, for example, is fully recharged in just 140 minutes.


  • Output power for fast charging of devices
    Not only the charging time of the power bank is important, but also the output power, which determines how quickly your devices are charged. The output power is specified in watts (W). A higher output power means that compatible devices can be charged faster. Our recommendation for a power bank is to choose a model with an output of at least 5 watts.

  • Size & weight of power banks
    The physical size and weight of a power bank are particularly important if you are on the move a lot. A lighter and more compact power bank is easier to transport, but may have less capacity and possibly a lower output power.
Ledlenser power bank connected to a smartphone

What connections do Ledlenser power banks have?

A distinction is made between the input ports and the output ports. Input ports are used to charge the power bank itself, while output ports are used to charge the end devices.

  • Input port: Ledlenser uses Micro USB and USB-C as input. Type-C is more modern than Micro USB and enables faster power and data transfer. Flex3 and Flex7 use Micro USB to charge the power banks. The newer Flex5 and Flex10 models use USB-C, whereby the Flex10 can also be charged with Micro USB.

  • Output port: All Ledlenser power banks have a USB output that is compatible with most small electronic devices. The two newer models Flex5 and Flex10 also offer charging of devices via USB Type-C.


What advantages do Ledlenser power banks offer?

In addition to the standard specifications, Ledlenser rechargeable power banks offer further advantages that make them special. This makes them perfect for outdoor use and for use together with other Ledlenser products.

  • Flexible power banks with replaceable batteries
    Ledlenser power banks are equipped with exchangeable standard rechargeable batteries in either 21700 or 18650 format, depending on the model. These batteries can be easily replaced, which is not only practical when the battery is exhausted, but also increases sustainability as the power bank does not have to be disposed of when the battery has reached the end of its service life.

    In addition, these rechargeable batteries can be removed from the power bank and inserted directly into compatible Ledlenser lamps, which makes their use very flexible. The batteries also charge up to 30% faster when they are in the power bank compared to charging in the lamps themselves. These power banks also serve as a safe transport box for the batteries, as they are doubly protected against short circuits and other environmental influences thanks to IP65.

  • Always informed thanks to charge level indicator
    An integrated charge level indicator shows how full the battery is at all times. This means you are always informed about the current charge level and won't suddenly find yourself without power. This is particularly practical on longer trips into the countryside, as you can better manage your power consumption.

  • Protected from moisture and dust
    Thanks to their IP65 certification, the power banks are both waterproof and dustproof. This protection makes them particularly suitable for use in harsh weather conditions, whether hiking, camping or at work. The robust construction not only protects the internal components, but also ensures that the power bank is ready for use in any weather. 

  • Other features
    Our power banks are approved for air travel and can therefore be carried in hand luggage without any concerns. Another special feature is the low current option, which enables the charging of devices with a very low charging current, such as Bluetooth headsets. This is a function that other good power banks do not offer and is particularly useful when you need to charge smaller devices on the go.
Power bank with charge indicator

Which power banks does Ledlenser offer?

Ledlenser offers four power banks. These differ mainly in their capacity and the standard rechargeable batteries they contain.

Ledlenser Flex3


With a capacity of 3400 mAh, an 18650 Li-ion battery and a weight of 88 grams, the Flex3 is a compact and lightweight power bank. These features make it ideal for short trips, activities or as an additional power source for everyday use. The IP65 certification guarantees protection against water and dust.

Features at a glance:

  • Dimensions: 10.9 x 2.7 x 2.7 centimeters
  • Weight: 88 grams (with battery)
  • Battery: 1 x 18650 Li-ion battery 3.6V
  • Battery capacity: 3400 mAh
  • Waterproofing: IP65
  • Charging time: 240 minutes
  • Connections: Micro-USB (input), USB-A (output)


Ledlenser Flex5


The Flex5 is equipped with a 21700 Li-ion battery and offers a capacity of 4500 mAh. It is IP65 certified, which makes it resistant to water and dust. Its charging time is 140 minutes. This makes the Flex5 a reliable partner for longer day trips.

Features at a glance:

  • Dimensions: 10.3 x 4.1 x 2.8 centimeters
  • Weight: 126 grams (with battery)
  • Battery: 1 x 21700 Li-ion battery 3.7V
  • Battery capacity: 4500 mAh
  • Waterproofing: IP65
  • Charging time: 140 minutes
  • Connections: USB-A (input), USB-C (output)

Ledlenser Flex7


The Flex7 is equipped with two 18650 Li-ion batteries and offers a total capacity of 6800 mAh. This power bank is ideal for longer trips, such as hikes lasting several days or camping trips. The charging time of 240 minutes, combined with a robust design and IP65 certification, make it a safe and durable power bank.

Features at a glance:

  • Dimensions: 10.9 x 4.7 x 2.7 centimeters
  • Weight: 164 grams (with batteries)
  • Battery: 1 x 18650 Li-ion battery 3.6V
  • Battery capacity: 6800 mAh
  • Waterproofing: IP65
  • Charging time: 240 minutes
  • Connections: Micro-USB (input), USB-A (output)

Ledlenser Flex10


With a capacity of 9000 mAh and a quickly replaceable battery system, the Flex10 offers the highest energy capacity in this series. It is also IP65 certified, which means it is well protected against water and dust. The Flex10 is particularly suitable for long hiking tours and many devices. It contains two 21700 Li-ion batteries.

Features at a glance:

  • Dimensions: 12 x 5.4 x 2.9 centimeters
  • Weight: 235 grams (with batteries)
  • Battery: 1 x 21700 Li-ion battery 3.7V
  • Battery capacity: 9000 mAh
  • Impermeability: IP65
  • Charging time: 240 minutes
  • Connections: Mirco-USB / USB-C (input), USB-A / USB-C (output)

Conclusion: Ledlenser scores points in the power bank comparison

When buying a power bank, it is important to select the right specifications such as capacity, charging times, output power, size and weight. The interchangeable and fast-charging batteries of Ledlenser power banks offer great flexibility thanks to their compatibility with other Ledlenser products. They also increase sustainability as they can be easily replaced. The robust design and IP65 certification make them reliable and resistant to water, dust and weather, so you can use them outdoors at any time.

In addition, the low current option allows you to charge devices with very low power requirements, which is particularly practical when you are on the move. The power banks' suitability for air travel is also an important aspect if you travel a lot.

So if you are looking for a power bank that is durable, flexible and suitable for outdoor use, the Ledlenser models in the Flex series are a good choice. They not only provide the power supply for your devices, but also the reliability and safety you need when you're out and about.

Questions and answers about power banks

The capacity of a power bank, specified in milliampere hours (mAh), is crucial if you want to charge your devices more often. A higher capacity allows you to charge your devices several times, which is particularly useful on multi-day hikes or camping trips.

The output power, specified in watts, determines how quickly your devices can be charged. A higher output power ensures faster charging, which saves time and is particularly beneficial when you are on the move.

The connection types, such as USB-A, Micro USB and USB Type-C, influence the compatibility and charging speed of your devices. Modern connections such as USB-C often offer faster power transfer.

Ledlenser power banks are optimized for outdoor use and offer features such as waterproofness (IP65 certification), a charge level indicator and the option of using batteries for other compatible devices. They are also protected against short circuits and enable the charging of devices with low power requirements.

The ability to swap batteries in power banks increases the life of the power bank and reduces e-waste. Replaceable batteries can also be used in other compatible devices such as flashlights, improving versatility during your adventures.

Yes, Ledlenser power banks meet the guidelines for air travel and can be carried in hand luggage. This is particularly important if you travel a lot, as you can ensure that your devices are always charged and ready for use, even when traveling.

A man is packing his backpack and adds a power bank