[..] I mark every battery with their shut down ( auto landing) residue percentage like 20%,10%,8%,5% etc. and before them I bring the drone low and close to the landing pad or over a grass area,[...]
good luck with that!
How do you establish the auto landing %tage?
Because that is entirely depending on the height of the bird and the "understanding" of it, how much batterie is still available.
It is a malfunction in the "intelligence", either of the batteries or the bird or both, in case it starts to "autoland", before it starts to RTH!
As long you are NOT interrupting a "Will RTH in x minutes" , there should be a RTH before an auto landing!
And because Parrot is not allowing to interupt the auto landing (like DJI let you do, with left stick up), you won't even find out, how much batterie is still available, shown in FF6 as 10, 20, 40, 80%!
I "checked" my batteries, so I thought, in a full battery hovering event, 3 times 20+ minutes, in 1.5+m height.
All batteries did well till the one digit %
I just forgot, that this looks different, in case the bird is far away and in a greater height!
Just needs longer, to get down.
But I counted on the battery related RTH feature
It just skipped that, like in the video!
And I think, that the FF6 is not getting the relevant in flight batterie info from the bird, too.
So there is a malfunction coded in the fw of the batteries, or/and the bird, somehow.
At least the battery should be able to understand its status.
They are "intelligent", we got told, right?