There seems to be some debate as to whether switching to a 5s battery would actually cause you draw less current or not. In theory, you should draw less current the higher the voltage to maintain the same power. So I thought I would test it out. What I want to test was is to maintain the propeller at the same speed and alter the voltage. Maintaining the same propeller speed is a bit difficult because of the large steps in the motor test values. Nevertheless, I was able to keep the propeller speed between tests close. Here is what I found: 16.8 volts at a motor test value of 55 spins the propellers at 2730 rpm and consumes 2.31 amps. 21 volts at a motor test value of 40 spins the propeller at 2760 rpm and consumes 2.12 amps. So it seems to hold with theory. It takes less current at the higher voltage to maintain the same speed. What's weird is that it takes way more power to maintain the same speed at the higher voltage; 38.8 watts at 16.8 vs 44.5 watts at 21 volts. I would have expected those two number to be closer.