Some major brands add a bitter coating on lithium coin cell sizes: CR2016, CR2025, and CR2032, 20mm diameter.
E.g. Duracell and Procell both use a bitterant coating (denatonium benzoate) on the negative terminal, looks like clear tape.
https://www.newsweek.com/toddler-almost-dies-swallowing-button-battery-2076197
E.g. Duracell and Procell both use a bitterant coating (denatonium benzoate) on the negative terminal, looks like clear tape.
https://www.newsweek.com/toddler-almost-dies-swallowing-button-battery-2076197
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