Accidentally punctured a small li-ion battery, any medical harm from the smell?
Not that I'm aware of. I've done the same from time to time. Acute exposure has never been problematic. What's inside is some kind of organic solvent that's proprietary. Knowing that and what we know about toxicity of organic solvents, your body may accumulate these over time if you have repeated exposure resulting in illness years down the line. If this is a one time thing, don't sweat it. Just don't make it a habit.