Tiny power bank for 167 CZK. Alza just discounted a hit with 5,000mAh capacity

The online store Alza significantly discounted its smallest power bank AlzaPower Onyx 5000mAh, which now costs just 167 crowns instead of the usual 279 CZK. The discount applies when using the code ALZADNY40, which is automatically applied at checkout. For this price, you get a tiny power source that you’ll especially appreciate as a last resort.

Miniature dimensions for everyday carry

With dimensions of just 63 × 90 × 13 mm and a weight of 102 grams, AlzaPower Onyx is among the smallest power banks on the market. It easily fits into a trouser pocket, a small handbag, or a headphone case. The power bank features two USB-A outputs with a maximum current of 2 A and a total power of 10 W, so you can charge two devices simultaneously.

Li-Pol battery with a capacity of 5,000 mAh (18.5 Wh) is realistically sufficient for one full charge of a typical smartphone or multiple recharges of smaller accessories such as wireless headphones, smartwatches, or fitness trackers. Four LED indicators show the charge status, and there’s also a practical strap loop.

Who is the power bank suitable for?

AlzaPower Onyx is primarily suitable as an emergency backup for unforeseen situations. It will be appreciated by people who don’t want to carry heavy, high-capacity power banks but still want to be sure of a charge when needed. It’s also ideal for charging small accessories – headphones, watches, or e-cigarettes.

The power bank includes six layers of safety protection against overvoltage, overload, short circuit, overheating, overcharging, and undervoltage. Smart IC technology automatically detects the connected device and optimally distributes power between both ports. The power bank itself charges via the Micro USB port in approximately 3 hours when using a 2A adapter.

Main disadvantages: no USB-C and weak performance

The biggest weakness of the power bank is the absence of a USB-C connector. To charge the power bank itself, you have to use an outdated Micro USB port, which means you need to carry an extra cable. Although the package includes a USB-A to Micro USB cable, you will need your own cable for charging modern phones with USB-C.

The second drawback is the power output, which the manufacturer states as only 10 W. While this will be sufficient for charging small accessories, don’t expect any kind of fast charging for a phone or tablet.

What do users say?

The power bank received a 4.6 out of 5-star rating on Alza from almost 500 customers. Users naturally praise its compact size and low weight the most. “I have 2 pieces, one for my bike and one for wandering around the city. It last saved me at Oktoberfest,” writes a satisfied customer Jakub from Prague.

Among the most common criticisms are the missing USB-C port and the fact that the power bank realistically only charges a phone once. “A fully charged power bank will only provide about 70% charge to a mobile phone with the same battery capacity, but it still serves as a portable emergency backup,” states reviewer Hana from Prague.

Several users point out that the power bank automatically turns off with low current draw, making it unsuitable for powering low-consumption devices such as LED lights or certain wireless headphones. However, it works reliably for regular phone charging.

Verdict: Definitely yes for 167 crowns

The AlzaPower Onyx 5000mAh at the promotional price of 167 crowns represents a good buy. You get a miniature power bank that will serve well for city strolls or as a “last resort” for long evenings. If you don’t mind the absence of USB-C and are content with a capacity for one phone charge, it will be a great purchase at the current price.

The power bank is in stock in quantities greater than 10 pieces, and Alza guarantees delivery to an AlzaBox the next day if ordered by midnight. In addition to the power bank, the package includes a USB cable and a Czech manual.

Would you buy a miniature power bank for 167 crowns?