Because at the beginning of V2 design, the version number was initially defined as 4S 30+15A. But later on, the MOS and board thickness were changed to increase to 60A 4S, and then changed to 6S 60A. You can check the specific MOS chip model, which I remember correctly should be 70A MOS

I recently purchased the v3 version and on the second flight, just as I was landing. The esc smoked, this could have been the problem. I sent it back and got a refund.