This cell would hit 3.4+Ah minimum down to 2.5V at 0.5A - 1A, even without the protection circuit burden (≈40mV at 1A), maybe 3.5Ah at 0.5A, but 0.5A is below the 0.2C official discharge current rating. Totally l00ks like a rewrapped Sanyo NCR18650GA (go check it out with the battery comparator).
I would no doubt open a dispute. I'd recommend choosing “product is not as described” or “counterfeit goods”. If you choose counterfeit goods and the seller doesn't cooperate you'll have to convince the AliExpress Case Management Team with proper evidence, at least like photo-comparing the cells with known good 30Q samples.
I wouldn’t mind a reasonable shipping cost but I forgot about customs/tax on your end. Makes sense.
All I’m able to do with my equipment is discharge with a Lii-202 (using that to charge a large portable battery pack) and then charge the cells in a VC4.
Yeah, still better than nothing.
But it could be a 3000mAh cell with high internal resistance for all we know.
If someone in Canada actually took the plunge, I could check.
Do you have some power resistors?
If you can parallel some resistors to get a load of about 10A, then connect and record the voltage instantly, you could easily calculate internal resistance and compare it to HKJ’s measurement.