Black Friday: This Xiaomi power bank costs only four hundred crowns. It has a large capacity and a brilliant feature

A dead battery in the middle of the day is one of those problems people solve either with a power bank or by constantly searching for an outlet. If you belong to the first category, Xiaomi 22.5W Power Bank with 20,000 mAh capacity for 429 crowns is an interesting offer. It’s not the fastest or lightest power bank on the market, but the combination of price and capacity makes sense.

38% discount – is it a good price?

The original 689 CZK dropped to 429 crowns, which is a saving of 260 CZK. For comparison – similar power banks with a capacity of 20,000 mAh typically range between 500-800 crowns. Xiaomi has a good reputation in the power bank sector, so for four hundred crowns, you are buying a proven brand.

20,000 mAh – how many times can you charge your phone?

A capacity of 20,000 mAh sounds impressive, but the reality is a bit different due to energy transfer losses. In practice, expect to get 12-14 thousand mAh of usable capacity. This is enough for:

iPhone 15 (3,349 mAh) – approximately 4× full charges
Samsung Galaxy S24 (4,000 mAh) – 3× full charges

For everyday use, this means you can last a weekend trip without an outlet. Or a whole day at a festival where you’re taking photos every other minute. Or a long train journey where you can watch series undisturbed.

Integrated cable: advantage or disadvantage?

The power bank has a built-in USB-C cable that cannot be removed – it is permanently attached. This has its advantages and disadvantages.

For most modern Android phones and iPhones (from the 15th generation), USB-C is the standard, so an integrated cable makes sense. Additionally, you also have a USB-A port available, so you can use your own cable for older devices.

22.5 W – how fast is the charging?

A power output of 22.5 watts is not groundbreaking, but it’s a solid standard. For comparison – the fastest power banks today offer 65-150 W, but they cost two to three times more.

What does 22.5 W mean in practice? You can charge a typical smartphone from zero to 50% in 30-40 minutes. This is a speed you’ll appreciate when you have a half-hour break and need to quickly top up your energy. It’s not lightning-fast charging, but it’s fast enough for most situations.

The power bank supports USB Power Delivery 3.0, which is a standard fast charging protocol. It works with most modern phones without issues.

Two outputs: an advantage for couples

The power bank has an integrated USB-C cable + a USB-A port. This means you can charge two devices simultaneously. Practical when traveling with a partner and both need to charge their phones. Or when you need to charge your phone and headphones at the same time.

However, be aware – if you charge two devices simultaneously, the power will be divided. So instead of 22.5 W, each port will receive less. This is standard operation for all power banks with multiple ports.

The product is available in stock at Alza, so you don’t have to wait. And if it doesn’t suit you? The standard 14-day return period applies.

Do you carry a power bank with you, or do you rely on outlets?