So, I keep a few flashlights on me in my everyday carry bag. Today, I was going through my gear and checking things, restocking OTC Meds, and cleaning out the cruft. To my dismay, I ruined on if my good flashlights. I have a Blackhawk Legacy Night-Ops flashlight that I use at work and for other activities. As you can see from the photo, the batteries corroded and have completely filled the tube.
As a reminder check your flashlights regularly if you store them with batteries in them and you are not using them daily OR if you can store them without the batteries in them.