Button (coin, watch, hearing aid) batteries are dangerous for kids to swallow — not just as throat obstructions, but because the batteries actually circuit across saliva and can cause serious, even lethal, internal burns. Even apparently dead (i.e., without enough power to make your widget work) can cause this problem.
These kind of batteries are in a ton of household goods, from flashlights to calculators to remote controls to bathroom scales, etc. If they are items that your young'uns might get hold of, make sure the battery compartments aren't something they can get open.
This isn't the first time I've head this problem recently. Here's hoping people take it seriously.
Reshared post from +Les Jenkins
For those of you with small kids, make sure coin batteries stay out of their reach.
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