The power bank is by no means the size it promises. I have had it for quite some time and from my experience, I estimate it to be around 15,000 mAh. Also, one morning it simply stopped working after 3 months of use and had to be replaced by the store where it was purchased, fortunately without any financial burden. Now, even the replacement power bank has the same capacity as I charge my iPhone Xs about 5 times (average battery size of 2500 mAh because it is old). It is also very heavy and cannot be carried anywhere without a bag, as it is not convenient to hold it in your hand. If I could choose to buy a power bank again, I would get a smaller one that fits in a pocket and is more reliable. Finally, although it does not have a 30k mAh capacity, it charges as if it does, resulting in it needing one and a half days continuously with a 2A charger.

The only positive thing I can point out is that it has every famous port available (2 USB Type-A, 1 Lightning output only, 1 micro USB input only, and 1 Type-C USB), so I don't need to get an additional cable and charger to charge it (having an iPhone with a Lightning port would require me to carry a Type-C cable for the power bank, as most power banks have Type-C and Type-A for charging and discharging).

Well, this specific power bank model x30 can be described in one word....BEAST!!!!
A beast both in its capabilities and in its portability....It is a very good power bank that can charge up to three (3!) devices simultaneously without slowing down anywhere!!!! I charge my phone 2&3 times and it only decreases one of the 4 battery level lights!!! What's also great is that even after days of not using it, the battery level, which is measured by four LED lights, stays exactly where you left it!!! The build quality, on the other hand, gives you a sense of luxury and that it's something more expensive than €30! It is beautiful and impressive. It has a variety of connections as it has 2 USB, 2 type C (one of which is micro), and one for iPhone. Now, when it comes to charging time, that's where you need to time it right if you want it fully charged at a specific time the next day...with a Samsung fast charger, it takes 14-15 hours to fully charge!!! Of course, it's logical as its capacity is 30000mAh...Its portability is also another downside as it is very, very heavy, weighing 630g. and this makes it very difficult to carry, like for example, for me who uses a banana-type bag every day and it doesn't suit me...while its volume is not small, it's like having 3 phones together to understand it somehow. However, personally, it has saved me as wherever I sit at home, I no longer have to be next to an outlet when my phone battery runs out, or when I'm playing PlayStation and the controller runs out of battery, I just connect it directly to the bank and that's it! As for the charging times of my devices, they are very fast!!! So, if you need it for daily transportation, you should think about it before buying it because of its weight, but if you want a mini power factory for small devices and more (it can even charge a laptop!!!) or to have it in your office, it's worth every penny to the fullest!!!