Finally (only 1 month after I promised I would) took the damn thing apart. Sorry about the low quality pictures, pretend the year is 1903 and be thankful for colour.
At first I couldn't see anything wrong with it internally.
I started taking the the box apart and (trust me on this even though the low quality pictures make it hard to see) only one part was damaged. trigger switch was 100% and everything
The biggest shocker was that the Piston looks brand new
The only part damaged was the gear that goes in the middle of the 3 gear set (never remember the name) half of it looked like it melted and flattened leaving only about 1mm of the teeth still intact.
heres the pics of it
Not nearly as extravagant as one would hope for death by car battery but now we know.