30Q, VTC6, and HG2 are all very similar. The difference between the three is so small that you would only notice by measuring using instruments.

There were some fraudulent batteries on Aliexpress sold by someone claiming to be Liitokala. If they were real, the price would have been very good, but they did not perform like real 30Qs. Liitokala chargers have a good reputation and a very low price. I do not recommend buying them on Aliexpress because someone might be selling fake versions of them too.