Seat touches battery

The seat rests on the battery and not the subframe so there’s a chance of the battery case getting split.  I used an old “knee puck” from a pair of dirtbike pants as a shim. It was just thick enough that I had to put a lot of force on the seat to latch it, so I shaved some off the top.

The puck was taped down, but after the first ride it had shifted off the subframe. This time I safety wired it. It hasn’t been tested in this configuration yet so I don’t know if that will make it stay either.

.  

Mystery part, #2.

What is this connector for? Why is it dangling?

Mystery piece, #1.

Should I be concerned that this is loose? Should I zip tie it to something?