Giant power bank for 741 CZK charges a phone up to 6 times and has an LED display. It usually costs over a thousand

Looking for an affordable power bank with decent capacity that can power both your phone and tablet? The Swissten Power Line II with 30,000 mAh has just been discounted on Heureka from the original 1,099 CZK to 741 CZK. For this price, you get backup energy for long trips, excursions, or simply as a safeguard.

30,000 mAh: how many times can you charge your phone?

A capacity of 30,000 mAh sounds impressive, but what does it mean in practice? It depends on the battery size of your device:

• Phone with a 5,000mAh battery – you can charge it approximately 5-6 times
• Phone with a 3,000mAh battery – you can charge it around 8-9 times
• Tablet with 8,000 mAh – you can charge it approximately 3 times

In reality, you have enough power for an entire weekend without access to the electrical grid, or for a week-long vacation with moderate use. For regular travel, this capacity is absolutely sufficient.

Charging speed: 22.5 W is not a miracle, but it’s enough

Swissten offers a maximum output of 22.5 W, which is not the peak performance of current flagships (which often handle 45W, 65W, or even 120W), but for most situations, it’s perfectly fine.

In practice, this means you can charge a phone with a battery around 5,000 mAh from 0 to 50% in about 30-40 minutes. A full charge will then take around 90 minutes. If you have a phone that supports faster charging (e.g., 45W), the power bank won’t be able to deliver its full potential, but it will still be faster than standard 10W charging.

It’s important that the power bank can charge 3 devices simultaneously – 2× USB-A and 1× USB-C. If you charge multiple devices at once, the power will be split to a total of 15 W, so it will be slower, but still functional.

LED display and practical details

Unlike cheap power banks with classic LED indicators, Swissten features a digital display that precisely shows you the remaining battery percentage. This is significantly more practical than estimating based on four LED diodes.

Included in the package is a USB-C cable for recharging the power bank itself. You can charge it via the USB-C port with a maximum input current of 3 A (18 W). This means that a full charge from zero to 100% will take approximately 6-7 hours. It’s not fast, but it’s standard for power banks with such a capacity.

Dimensions of 146 × 68 × 41 mm and a weight of 603 grams are not negligible – it won’t fit in a pants pocket, but it will fit in a backpack or a smaller bag. It’s a compromise for the high capacity.

Where to buy and how long the discount lasts

Currently, the power bank is available on Allegro for 741 CZK. The original price of 1,099 CZK still applies at some retailers, so be careful where you shop.

The discount is not a time-limited promotion, but rather an ongoing price reduction due to market competition. This means that the price could remain stable for several weeks, or conversely, quickly return to its original level if stocks sell out.

Do you use a power bank regularly, or only occasionally for travel?