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41 - EASA Drone A2 License - What does a 4S LiPo battery designation mean?

Question 41 - Flight performance and planning - EASA Drone License A2

It contains 4 cells connected in series, adding their voltages together
It will last for exactly 4 hours of flight time
It is equipped with 4 separate temperature sensors
It contains 4 cells connected in parallel

Training tests and timed exam simulations EASA Drone License A2