Package did not get received. I got "evidence" that it was received with a wrong tracking number. I had been told by AliExpress that the package was in "my local post office" and I have been contacted. None of this was true. Nobody responded to my simple query of even a name or some number as to who should I contact. Everywhere I search online for my package number gives me that it does not exist. And no money back as well. I strongly urge to stay away from the store/website.
The battery came quickly. The functionality is fine - full charge at 42V, when fully discharged the protection board disconnects the battery. However the capacity is much lower than 15000mAh (15Ah). I measured full charge/discharge 3 times and each time I got 11Ah capacity. You can see at the photo the capacity at 30V - around 5 minutes before battery switched off. I guess the seller used 4000mAh cells instead of 5000mAh...
photo missed from the original feedback, here it is. I suppose the seller used 4000mAh cells in this battery instead of 5000mAh.