Regular Energizer batteries are too common to be featured here, but these are Energizer Industrial batteries. A neighbor of mine is a surgical nurse, where they often use small, battery-powered, single-use irrigators to pump water onto a surgical site. These irrigators come from the manufacturer with the batteries pre-installed. Sometimes these devices are used only for a few seconds. When the surgery’s over, the nurses crack open the irrigators, retrieve the batteries, and throw the rest away.