Duracell batteries are everywhere—TV remotes, game controllers, flashlights, and just about any gadget that needs a reliable power source. And that's no accident. With a reputation built on ...

a Duracell, 76 shots; and the lowest-rated alkaline, just 49 shots. Our flashlight test involves the equivalent of turning a flashlight on for 4 minutes every hour for 8 hours, letting it sit for ...