DIY 8*18650 Battery Power Bank Case Charge Storage Box 5V Dual USB Type C Battery Holder Box PD QC3.0 Fast Charge For SmartPhone

Ni Hu Ya Not Fast Charging!!!!!!!! Took it for 1.5 bucks, so it's fine.
And so, in principle, a simple regular power bank, assembled 20k+, works fine. If fast charging is not essential, then I recomd

The power bank case arrived very quickly in 10 days, although it was delivered by Ukrposhta. Some plastic is better than expected, because in the photo it looked like cheap plastic. Everything is well-soldered and matches the description for such a price, it's good. According to the amperes, it outputs 1.4-1.5A per connector, which is not bad in principle. I used second-hand 18650 batteries from a screwdriver, and for this task, this case was perfect for me. This case also has two LEDs, which is convenient when you need to illuminate something and have nothing on hand (it turns on/off when you press the buttons on the side).

Installed eight flat-top cells quite easily. Unit clicks together nicely and feels solid.
Checked ok that all outputs are working.
Checked ok that charging function works.
Checked ok that flashlight function works.
Note that the display stays on during charging and discharging. I could not find a way to turn off the display during discharging.
Unit is good for the price.