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...However, I keep on smelling this sweet smell...
The sweet smell is battery electrolyte. My Leaf has that smell when I open battery disconnect hatch behind front seats. I took apart A123 m1A LiFePO4 cell one time, and whole room was filled with strong sweet smell once I unrolled the battery. It must be the electrolyte.

I think pouch cells do vent electrolyte gas through tiny gap between cell tab and plastic pouch.
 
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