I notice that at the bottom of this report It show 15 volts can you explain that? Also, can you explain at Line 10893 and 10894 voltage displayed at 9.2 volts yet, the craft was still flying and Voltage jumped up to 14.6 at line 10895.I believe that was the likely trigger that ended the flight. The battery was near depletion and the added power demand simply dropped the voltage to a value that caused the aircraft to shut down.
However, it's also troubling that the battery dislodged on impact. That shouldn't happen if the battery latch is secure. If the battery came out it was either not locked or the latch broke on impact. So it is conceivable the battery moved enough during a high speed maneuver to loose good contact if the lock was not completely engaged.
The last 5 seconds of flight show the dramatic loss of voltage and shut down. Note the battery reconnected prior to impact.
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