Powerbank PISEN 20000 mAh from China

First, let's decide what kind of beast it is ?!.
This device is popularly called differently - power bank, power bank, portable charger, external battery, power bank , "Power bank", but the purpose of this device from China remains the same. The main purpose is to recharge mobile devices: phones, tablets, cameras, mp3 players, etc. In fact, this is a large battery, with a huge (compared to mobile devices) amount of stored energy.

Specifications:
Manufacturer: Pisen
Type: 18650 Power bank
Model: TS-D199 DianKu-20000mah
Color: White
Capacity: 20000 mAh (74Wh)
Capacity (per discharge) at 5V: 1A - 13300mAh
Capacity (per discharge) at 5V: 2A - 12800mAh
Input: 5V 2A
Output: 5V, 1A / 2A
Charge / discharge cycles: 500
Operating temperature: -10 - + 40C
Charging time: 11 hours (5V, 2A)
Size: 161 * 83 * 23 mm
Weight: 475g

Types of protection

Declared 7 degrees of protection:
Overload protection
High temperature protection
Short circuit protection
Overdischarge protection
High voltage protection
Overcharge protection
Overcurrent protection

Some of them were verified during testing, for example, when the current limit rises to 2A, the protection is triggered and the device turns off; when the contacts + 5V, -5V are closed, a shutdown also occurs, short-circuit protection is triggered.

Sentence:
The opinion of the Pisen 20000mAh remained ambiguous, on the one hand it is good build quality, honest capacity, an informative display, on the other hand, only 2A per output, lack of support for modern charging standards (QC 2.0, 3.0), not small dimensions and weight.