I'm not an expert or even close..your notifications show a really rapid
battery loss.
Like Madame Brown says. the #3 cell has excessive difference the entire flight..however..I have checked the cells while flying with mine and had them all in the green and when I check that flight on Airdata it shows one completely red like yours.
you can tap on the
battery while flying for that information.
I really don't know which one to believe but I can scroll through every flight with that
battery on Airdata. When I do that it doesn't show a trend, It show's that
battery with that indication intermittently nearly the entire life of the
battery. Have I been lucky? probably.
You don't want a critically low
battery warning during a flight. The drone will land and all you can do is steer it and slow the decent. That can happen with a too large difference between the cells even with a large percentage of
battery remaining.
I would stop using the
battery.