Charged fully 3 times and on the 4th, no matter how many chargers or cables (functional) I tried, it did not respond. While it shows 25% battery, it does not charge.
Waste of money, I would not recommend it.

Nothing awesome, a decent power bank for its price. The instruction sheet mentions a rated capacity of 5000mAh which seems to be generally accurate. I know that theoretically mAh cannot be directly compared, but regardless, it charges my phone once (from 10% to 100%) and a little more (20%), which has a 4500mAh battery. The indications 100-75-50-25 obviously show a voltage, and do not correspond at all to the capacity. When it reaches 50%, it still has a little juice left. It charges quite fast up to that point, but then the charging speed drops significantly. I don't believe it maintains a constant 2A even at 100%, but it is much faster than charging through a car USB or laptop, etc. I estimate it operates at around 1.5 - 0.5A.
As for the construction, it's okay, I liked that it's slim and very convenient.
Overall, I would say it's decent and offers good value for money.

After a short time and use, not more than 10 times for charging my phone on a hot day in the bag in the car, the power bank battery swelled, causing me to throw it away immediately, so for me it's not worth it even if it costs 2 euros

My phone needs 2 Ambers for fast charging. This specific power bank claims to have an output of 2.1, yet it charges slowly, which means it's another Chinese product with incorrect information both in terms of charging numbers and capacity (it's half of what it says in mAh). Only Xiaomi without a second thought!

It is exactly what I expected for the money, a decent product. My child tried it and was satisfied.

In the positives, it is lightweight, well-made, and charges the phone slightly slower than the charger, but the time is acceptable.
In the negatives, it has an actual capacity of about 7200 mAh (charges a 6000 mAh battery 1 full charge + 20% on the second). The 4 charging indicators (25-50-75-100%) do not correspond to these levels because during discharge, when the 75 goes off, the next indicators 50 and 25 go off immediately, meaning it discharges very quickly and completely after 75. The same happens in reverse when charging, it reaches 75 immediately and then takes 4.5 - 5 hours to fully charge with a fast charger.

Excellent, small and lightweight, charges quickly and charges mobile phones quickly. With two USB-A ports, one type-C and one micro USB. With battery indicators 25%-50%-75%-100%. It fully charges a 4500mAh mobile battery comfortably twice.

It has approximately the size of a 5.5" mobile phone, it is relatively lightweight, very good build quality, bright level indicators, 2 USB ports, one type C and one mini, flawless so far.

12/06/22
I am quite satisfied, but I noticed that it takes a long time to charge, not the devices, but it itself takes a lot of time, maybe 8 hours, I don't know if it is normal.

Former owner of the bulky xiaomi mi powerbank 2s 10000mah, which turned out to be just a brick and overall a mere advertisement, etc. I won't forget that along with my phone and a few trinkets, the bag became a dumbbell! This is the raw and unfiltered truth.
So, I ended up with this.. lightweight and slim with a 2-year warranty, and what does it do?.. it charges the phone.. the pictures speak for themselves Xiaomi=free badass