What Helmut is saying is that just reading the telemetry file we cannot see what was happening on the ST-16. We also need the remote file he mentioned.
As he mentioned, the battery is also very suspect with the rapid voltage drop at the beginning. Do you have a third party charger so you can put the batteries at storage charge or are you just using the OEM charger?
Flying that long after a level 2 battery warning is very risky. With the rapid voltage drop at the start and then the length of time you flew where the voltage hovered around 14.6 to 14.5 volts, I would venture to guess that there is a cell with a very high IR that depleted quickly and stresses the other cells.
OK here is the Remote File
Thanks