Technical features:

• Battery: 18000 mAh, Li-polymer 21700 x 4 pcs (charging time up to 9 hours)
• Type C input: 5V/3A, 9V/2A, 12V/1.5A (18W)
• Output Type-C: 5.0V/3.0A, 9.0V/2.22A, 12.0V/1.67A (20W)
• USB-A QC 3.0 output: 5.0V/3.0A, 9.0V/2.22A, 12.0V/1.67A (20W)
• Built-in protection against short circuit, overcharge and overdischarge
• LCD battery status indicator
• Operating temperature: 0-45 °C
• Dimensions: 54 x 60 x 86 mm
• Net weight: 0.36 kg

Same summary

The Gembird Power bank QC3.0 18000mAh portable battery is especially suitable for users who often use their smartphone on the go and need reliable backup power. Due to its 18000 mAh capacity and 20 W output power, it is capable of quickly charging phones and other smaller devices, such as headphones or smartwatches. The balance between size, weight and capacity is designed for practical use in everyday life - it is small enough to carry in a bag, but offers multiple recharges. The slightly larger capacity means that it can be a bit heavier compared to the smallest power banks, but this usually does not hinder everyday use if more power on the go is the priority.

Recommendation source: Enaa guides and team experiences.

User view

This power bank is most often used by individuals who spend a lot of time away from home or traveling, as it allows for fast charging of phones when there is no access to a socket. It is popular with students, business people and anyone who wants to charge their device several times during the day or at longer events. Due to its capacity, it is very practical for festival days, trips, lectures or when you spend the day in nature and want to remain reachable.

Users often choose Gembird products because of their quality-price ratio and proven reliability in everyday use.

Why buy at Enaa

When purchasing through Enaa, you can count on accurate stock displays and verified descriptions, which reduces the chance of making the wrong choice. Enaa also allows you to easily compare different power bank models to quickly find the most suitable solution based on your habits and needs.

Answers to frequently asked questions

How many times can I charge an average smartphone with this portable battery?

You can charge most modern smartphones with an 18000 mAh capacity about 3 to 5 times, depending on the size of your device's battery and how you use the power bank.

Is this power bank also suitable for tablets or other smaller devices?

Yes, in addition to phones, you can also charge tablets, wireless headphones, or smartwatches with an output of up to 20 W. However, it may not be enough for very demanding devices (such as laptops).

Can I charge multiple devices at the same time?

That's right - multiple ports allow you to charge your phone and an additional accessory, such as headphones or a watch, at the same time. Be aware of the total power if you connect multiple energy-intensive devices.

Is the product suitable for fast charging modern phones?

The power bank with an output of up to 20W and QC 3.0 allows for fast charging if your phone supports this feature. For even faster charging, you would need a more powerful model.

What if I need a portable battery that is as light and pocket-sized as possible?

The 18000 mAh model offers a higher capacity, so it is slightly larger and heavier than pocket models with smaller capacities. If weight is a priority for you, choose a power bank with a lower capacity.

Description updated: April 2026