When I first began my career in the fire service, about 12 years ago, I bought a Streamlight 4AA ProPolymer® LED flashlight. It has sat on the brim of my helmet since then and has been really put through the ringer. Heat, smoke, water, impact...you name it. It survived without any maintenance/repair until about a month ago. I have to really hand it to you guys...Y'all make one helluva product. Naturally, the replacement was another Streamlight!