title_body: Is there an advantage to having more LiPo cells in a low-power drone?
upvoted_answer: The advantage of running at higher voltage is that you can use thinner wires and lower current (i.e. cheaper) ESCs, as power lost to resistance is proportional to current (squared) and not voltage.
  
  Another reason can be to reach higher prop RPM when you can't find motors with sufficiently high kV, or merely want to continue using the motors you already have. 
  
  Much of the discussion about increasing cell count is confused because people increase the total battery size, for example, going from 4s 1500mAh to 6s 1500. With 50% more battery it's not surprising that both flight time and the ability to provide bursts of power without voltage sag have increased. Similarly pushing more power through the same motor is not a free upgrade. Either it's using up a safety margin or the motors were larger and heavier than necessary in the original design.