What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On the evening of 05/07/2022, the PIC noticed the battery was weak and was unable to start the engine.
PIC returned the morning of 05/08/2022 with an automotive battery "power pack", sometimes called a "jump starter", and connected it to the external power supply port on the right side of the fuselage, with the assistance of a volunteer ground crew member.
The engine started sooner than the pilot expected he wrote in his statement that the engine "normally takes 10-12 cranks" but started "in less than one turn".
This surprised the pilot and he was unable to take proper control of the hand or toe brakes before the aircraft moved forward about 40', turned about 30° to the right, and struck a medium sized tree with a 1' high wall of bricks at its base.
Immediately the pilot moved the aircraft from its resting position back to a tie down/parking spot with the help of some passerbys. This was against the advice of the "gate one" FBO staff at the scene.
As the FAA filed it
ON THE EVENING OF 05/07/2022, THE PIC NOTICED THE BATTERY WAS WEAK AND WAS UNABLE TO START THE ENGINE.
PIC RETURNED THE MORNING OF 05/08/2022 WITH AN AUTOMOTIVE BATTERY "POWER PACK", SOMETIMES CALLED A "JUMP STARTER", AND CONNECTED IT TO THE EXTERNAL POWER SUPPLY PORT ON THE RIGHT SIDE OF THE FUSELAGE, WITH THE ASSISTANCE OF A VOLUNTEER GROUND CREW MEMBER.
THE ENGINE STARTED SOONER THAN THE PILOT EXPECTED HE WROTE IN HIS STATEMENT THAT THE ENGINE "NORMALLY TAKES 10-12 CRANKS" BUT STARTED "IN LESS THAN ONE TURN".
THIS SURPRISED THE PILOT AND HE WAS UNABLE TO TAKE PROPER CONTROL OF THE HAND OR TOE BRAKES BEFORE THE AIRCRAFT MOVED FORWARD ABOUT 40', TURNED ABOUT 30° TO THE RIGHT, AND STRUCK A MEDIUM SIZED TREE WITH A 1' HIGH WALL OF BRICKS AT ITS BASE.
IMMEDIATELY THE PILOT MOVED THE AIRCRAFT FROM ITS RESTING POSITION BACK TO A TIE DOWN/PARKING SPOT WITH THE HELP OF SOME PASSERBYS. THIS WAS AGAINST THE ADVICE OF THE "GATE ONE" FBO STAFF AT THE SCENE.