If you plan to fly 5S, than a motor with kV ~500 is needed. In case with Hacker 50 series that should be A50-12S.</p>

I used to fly Angel with A50-16S on Rhino 6S 3700mAh with 16x10 prop, but the next one will be on A50-12S, Rhino 5S 4900mAh and 15x10 prop.</p>

What should be absolutely taken into consideration is that not all batteries perform the same, actually they perform very different.</p>