I accidentally made a small puncture in an old li-ion battery while replacing it in my phone (it's stuck on pretty tightly with adhesive). A couple of sparks, but no flames. It has been safely disposed of.
The damaged battery emitted a sweet smell after it was punctured, so I immediately went outside to complete the removal. I feel fine and everything, I just want to be sure; is there any potential harm that could come from briefly inhaling the fumes?