In todays market, you will see a lot of cheap generic power banks in varying capacities ranging from 2, 500mAh up to an outrageous 50, 000mAh. While it is really tempting to buy these types of power banks, one major concern about them is QUALITY. Since most of these power banks are manufactured in bulks, quality control can be a major challenge especially when talking about tons of shipments.
Another thing about generic power banks is that fact that they usually sell in MARKING capacity and not in REAL capacity. That is the reason why branded power banks with much lower capacity are able to charge more or about the same as those with 20, 000mAh generic ones.
Therefore, if your are planning to buy a new power bank, it would be much wiser to spend a few more bucks to get a branded unit with better QUALITY.