Hi,
Complementing
previous post:
(Very probably)
Current (Hundreds of Amps) flowing due ~12V (cells 1, 2 and 3) was limited by ~1m Ohm (3 cells in series), contact of cell 3 (or 4) to battery case and battery ground wire.
This current stopped after plus terminal of cell 3 disconnected (destruction of it )
Very probably the plane landed with "NO DANGER". (Fuse was yet open)
Obviously without itīs main battery (no availability of energy due open circuit)
PS
Ground wire probably was cut in the right. In the left, shows damage due high current.