That battery was beyond rescue both before & after this flight...
don't use it again, instead dispose of it in a proper way.
This battery didn't only get a failure in one of the cells, which is typical if the battery have been sitting for a long time & self discharged & got the cell voltages go out of balance.
This battery showed major voltage drops every time you demanded amp draw from it... the reason for this is most likely a very high internal resistance. A charge will not fix this... it will happen again & then you maybe lose your drone also. On top of this, this flight pushed all cells well below 3,0V, which created even more permanent damage.
The chart below depict the entire flight & show graphs for the battery percentage (calculated by the BMS chip), the cell voltages, the flight pattern regarding height & heading speed (these require a lot of amp draw).
As seen below, the cells show very little voltage deviations... instead they show major voltage drops every time the battery needs to deliver amps... every time you ascend or accelerates horizontally. When you let off the sticks the voltage recovers somewhat but never to the same level as just before the amp draw.
46sec after take off & after 4 ascends & 3 accelerations all cells was well below 3,0V & the forced "critical low battery voltage" landing started (pink background color).
The reason for that the battery percentage suddenly dropped to 0% was that the BMS chip gave up... it couldn't make sense of the rapid voltage decrease & figured out that those 60% at start in fact was wrong... this behavior is typical when batteries fail.
(Click on the chart to make it larger, check the legend under the chart for what the graphs represent)
(Have placed the chart marker where the voltage is as lowest at 46sec... the graph values from there can be read off in the legend)
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