The original lead acid battery took up much of the space in the frame triangle. The Li battery is still a tight fit. It is shoe horned into the frame parallel with the rear fender.
I tried using latex paint and mold release spray on the styrofoam before applying fiberglass. This does not work as well as masking tape and butcher’s wax. The paint stuck to the fiberglass. Next time, I’ll try latex paint and wax.