Gas Fumes

BEFORE (for safety) you put the trunk mounted cell in, you should have fabbed up some 18gage sheelmetal and welded it along the rear
pakage tray, down and around the wheelwells, and finally to the trunk floor.

now for the smell/safety.. block/cover/weld up any holes on the rear pkg. tray. that includes the speakers (if applicable).

next i would surround the whole trunk compartment with fire proof (resistant actually) insulation.

sorry no pics.