Hat geantwortet auf: Battery odour, Headaches and polish smell ... Why?The rechargeable Li-ion batteries that you work with contain several solvents. The two that have distinct odors are dimethyl carbonate (DMC) and diethyl carbonate (DEC). Most other solvents in Li-ion cells are odorless. So it's likely that you are smelling those solvents. DMC has an alcohol-like odor, while DEC has a weaker, milder ester-like odor (like nail polish). Neither are particularly toxic, and in fact dimethyl carbonate is classified as a 'green' solvent. DMC does metabolize into methanol, and if you get enough in your system, you'll get methanol poisoning. Headaches are one typical symptom of mild acute methanol toxicity. It's not likely that you are in serious danger, but long term exposure (over years) can cause health problems. Use good ventilation and you'll be fine. Primary Li batteries are another story. Their odor probably comes from dimethoxyethane, which has a sharp chemical odor. It is classified as potentially toxic and on OSHA's watch list.