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So, it happened twice last week.
I have a 2019 DJI Mavic Air with two batteries. Each battery performed about 100 flights (charged about 100 times).
I had a fully charged battery (charged day earlier). I took off, everything was normal, but after 20 seconds, battery charge went straight from 89% to 0% in the flight log, with critically low voltage warning. I landed.
In the evening I charged the battery, next day performed full flight without issues (landed maybe at 30% of battery).
Next day, another forced landing with battery going from 88% to 0% immediately. After landing, the voltages are 4,05V / 4,05V / 4,06V = 12,16V (battery temperature 33°C), which seems to suggest battery ~80% full. During flight and critical warnings I didn't go into battery options, I landed as soon as possible.
This happens only on one of 2 batteries. What are your thoughts, suggestions, hints?