The two cell has fairly well matched discharge curves. The over current protection trips at 5A on one of the cells, but first after just before it is empty.
The cell gets warm at 5A, but nothing serious.
When the battery is cold it can deliver about 7A before over current protection trips.
Conclusion
The battery looks to be good quality with a working protection. The capacity matches what you get from a 3500/3600mAh battery.
Which is curious, because there's no reasonable way you can obtain 3500/3600mAh from them. If capacity were to be defined for 1C discharge rate, a 3000mAh figure would be a lot fairer for this cell.
There might be a little more capacity in there - HKJ discharges to 2.8V, but quite a few manufacturers rate for discharge to 2.5V nowadays. 3500 / 3600 mAh is definitely reaching, though. Manufacturers would get a lot more trust from me if they made proper datasheets available as a matter of course, so I could see how they arrived at their ratings.
Having said that, I’m fine with 2.8V and leaving some capacity unused to make sure I don’t inadvertently abuse my cell.