I think the V3.1 stock spec is only designed for handling 10.5T or above motor but in cheapest price and with all characteristics from V3.1. To be honest, the current draw for 10.5T or above is not as high as low wind motor, it is happy to see Hobbywing making such ESC with reasonable price. BUT, beside the casing or the like, I hope they made the V3.1 stock spec, at least, should equal to their top model ESC’s internal resistance. This mean the stock spec ESC will has similar power and handling of original V3.1.