This 30,000mAh power bank now costs only 506 CZK! It has excellent ratings, a display, and three ports

A power bank with a capacity of 30,000 mAh used to be an item costing over a thousand crowns until recently. The ChoeTech B730 with this capacity now costs only 506 CZK instead of 779 CZK with the discount code ALZADNY35. For the price of a better USB-C cable, you get an energy supply that can charge a modern phone up to five times. If you want to check current stock availability (stock changes quickly with these promotions), you can find everything directly in the product details.

Quick summary:
✅ Makes sense if you’re looking for a cheap backup battery for trips, festivals, a cottage, or long journeys and can put up with slower charging of the power bank itself.
⚠️ Consider carefully if you need fast charging above 30 W or want a lightweight power bank for your handbag – 607 grams is not a feather.
💡 For 506 CZK, it’s one of the most affordable 30,000mAh power bank options on the Czech market.

Why this power bank is interesting

The key figure is 506 CZK for 30,000 mAh. Converted to crowns per unit of capacity, this is approximately 17 haléřů per 1 mAh, which is a very low value in the category of larger power banks. Competitors with similar capacity typically stay above 700–900 CZK, and branded models from Xiaomi, Anker, or Baseus in this capacity even approach a thousand. The ChoeTech B730 with code ALZADNY35 drops a class lower.

The second reason is practical. With a capacity of 30,000 mAh, you can charge a typical smartphone about four to five times. For weekend events, international travel by train or bus, festivals, or a cottage without electricity, this is a capacity you won’t easily deplete.

Key parameters explained simply

The power bank offers three output ports: two USB-A and one USB-C, which also serves as an input for charging the power bank itself. The maximum output power on USB-A is 22.5 W with Power Delivery support, while USB-C outputs up to 20 W. When charging three devices simultaneously, the power drops to 15 W distributed among the ports.

Above the three ports is an LED display showing precise charge percentages, which is rather an exception for cheaper power banks. You don’t guess based on four LEDs, but see the exact number. The weight is 607 grams – with this capacity, nothing under half a kilogram can be expected, and the B730 is actually medium-heavy in its category. Unlike 50,000mAh variants that approach 1 kg, you can still carry it in a backpack without it dragging you down.

Practical aspects: ports, display, usage

The three outputs work simultaneously, so you can charge a phone, headphones, and a speaker from the power bank all at once. A handle or strap makes carrying easier – it’s not the most elegant solution, but if you’re lugging it around a festival or campsite, you’ll appreciate it. The USB-C input supports fast charging at 18 W (9V/2A or 12V/1.5A), so with an adequate charger, you can replenish its energy in a reasonable time.

A crucial point before purchase: with this capacity, you cannot take it on an airplane. Airlines usually permit power banks up to 100 Wh in the cabin, which corresponds to approximately 27,000 mAh – the B730 has around 111 Wh and thus exceeds the limit. If you fly frequently, consider the smaller B729 variant with 20,000 mAh, which airlines accept.

What users say

The power bank has a rating of 4.7 out of 5 (322 ratings) on Alza, with over 2,000 units sold, and 90% of customers recommend it. The return rate is relatively low at 2.3%. Users most often praise the price-to-performance ratio, large capacity, and practical digital display showing precise percentages.

Critical voices consistently appear for two things. The first is the long charging time of the power bank itself – several users state that with a standard charger, a full charge takes even 6–7 hours, and even longer with an underpowered charger. To achieve the declared 18W input, a charger supporting QC 3.0 or PD of at least 20 W is needed. The second complaint: a scratched display upon unboxing. Most of these cases, however, stem from users not removing the protective film – it’s thin and easily overlooked. One customer (Libor, Bílina) explicitly confirms: “The display is not scratched, it’s just a film.”

A long-term user from Slovakia (Marek, Prievidza) describes specific speeds after an extended test: it charges a Xiaomi 14T Pro in about an hour, and a Samsung from 55% to 100% in 40 minutes. According to him, the power bank handles weekend charging of three mobile phones, a speaker, and a trail camera without issues. Occasionally, there are also complaints about defective units – typical for any electronics in this price range, but thanks to the low return rate, these are exceptions, not the rule.

If the B730 didn’t appeal to you, but you’re looking for a power bank or other accessories on sale, you can also browse the current Alza Days, where other discounted power banks, chargers, and cables regularly appear. The offer changes continuously based on stock availability.

When this power bank doesn’t make sense

If you want really fast charging above 30 W (e.g., for a laptop via USB-C PD), this power bank is not for you – the maximum output of 22.5 W is rather basic for contemporary fast-charging standards. For a modern MacBook or Windows laptop, it’s worth looking for power banks with PD 60–100 W, which, however, start at a significantly higher price.

The second dealbreaker is air travel. The capacity of 30,000 mAh (approx. 111 Wh) exceeds the 100 Wh limit that airlines permit in carry-on luggage. If you fly frequently, it’s better to choose the B729 variant with 20,000 mAh. And thirdly: if you’re looking for a compact pocket power bank for daily charging of one phone, 607 grams is unnecessarily much – the smaller B728 with 10,000 mAh for 449 CZK will do that job better.

Verdict: who it’s worth it for

For 506 CZK, you get a power bank that you’ll welcome anywhere you don’t have access to an outlet for several days – at festivals, multi-day trips, camping, cottages without electricity, long train and bus journeys, or as a backup power source during an outage. For five hundred crowns at this capacity, it’s one of the most affordable offers on the Czech market, and with a low return rate and over 2,000 units sold, it’s a fairly proven model. Don’t expect fast charging at the level of premium brands here, but for its price, it delivers exactly what it’s supposed to.

What power bank capacity do you consider ideal for your travels?