this is just a general question I would like to ask which is related to an issue that I have been dealing with lately.
I built a hexacopter with a weight of 8.5 Kg, I am using a 14000 mAh lipo battery with it. The batteries are brand new (Tattu 6s 25C lipo).
Before the flight, I charged my battery and took it for testing. The initial voltage was 25.1 Volts but when taking off the voltage dropped to 22.5 Volts and the average current consumed by the system was 46 amps. According to my calculation, I should have at least got 14 minutes of flight time but ended up with a flight time of 5 minutes only.
Somehow, the voltage is dropping really fast and the capacity of the battery is not being utilized completely(only 18% of the battery was utilized by the system).
My question is how can I identify what is causing this sudden voltage drop?
Your experienced suggestions are most welcome.