Voltage sag at beginning of flight - what happened?

[Yaros]

The battery you used there isn't up for this kind of flying, I guess it have a substantial number of charge cycles & is close to a couple years old. In this flight you were 0,3V away from a forced low battery voltage landing (imagine if you had kept the stick commands for a little longer)... and you were above water the whole incident.

The battery has about 175 charge cycles, which isn't that much, and was manufactured in December 2020, I bought the drone in August 2021, I have 160 hours of total flight time and 3000km across my 3 batteries.

Regarding the "kind of flying", I wasn't trying to stress the battery, I wasn't even in sport mode, the was no wind where I was standing, and maybe the wind was coming from the port, on the left side of the drone. I wasn't pushing the throttle nor elevator full way because I wanted the battery to heat up before I start flying more aggressively. I regularly checked the cell voltages during the flight, and didn't see it go low enough for me to bring it back for landing.

I had a friend flying an Air 2S at the same time as I was flying the Air 2, I might look at his logs, because his batteries have 4 times less charge cycles as mine. I will compare the voltages and overall performance of our batteries.

 

[slup]

The battery has about 175 charge cycles, which isn't that much, and was manufactured in December 2020...

Regarding the "kind of flying", I wasn't trying to stress the battery, I wasn't even in sport mode, the was no wind where I was standing...

Well, you can "put lipstick on a pig" as much as you want... it will still be a pig. The data recorded doesn't lie, the voltage drop really happened, the wind was a real factor where your drone was (which wasn't where you were standing)... and even though you thought you treated the battery nicely, it was still too much, & more what the battery could cope with.

By the way... this was the winds your drone felt during this flight.

 

[Meta4]

This is strange.

People on the DJI Forum are telling me that it is more or less normal behavior for a battery, but I don't think so.

It's normal for a battery that's no longer in prime condition.

DJI's specs for the Air 2 show the battery having a full capacity of 3500 mAh.
But your flight data shows the full capacity of your battery to be 2863 mAh.
It's lost 18% of it's original capacity over 172 charge cycles since new.