"Button battery" summons up a fairly familiar image for most US-based readers. Here's a picture for you: https://upload.wikimedia.org/wikipedia/commons/c/c7/Co

"Button battery" summons up a fairly familiar image for most US-based readers. Here's a picture for you: https://upload.wikimedia.org/wikipedia/commons/c/c7/Coin-cells.jpg https://upload.wikimedia.org/wikipedia/commons/c/c7/Coin-cel...