"The only added weight is the 2 extra motors/arms/props/esc etc but it hovers at a lower rpm due to the extra thrust. I am fine with the extra 5-6amp draw but not sure why the voltage is dropping below 10v, On the 450 I could get 7min out of a 5amp…"

"I am having a similar issue, with a f450 I was pulling close to 18a at hover and around 1v drop from resting voltage. I upgraded to a f550 and during hover the amps are around 25a and voltage drop is close to 2v on the pixhawk. I hooked a voltage…"