I like to keep all those little small parts in plastic divider boxes including spare batteries for my digital Wixey tools and other electronic gadgets. You know those cute little flat batteries 1/4" to 3/4" in diameter. I had a few loose ones along with a 9v in reserve. Apparently when I closed the drawer they were in, I initiated launch sequence. A little while later, I needed a part from the box and discovered one of those little batteries had blown apart. Batteries stay seperated now..batteries 002.jpgbatteries 004.jpg