Anyone mess with these? I have a Streamlight Stinger I've had since 2003. It's been a good light and I don't want to replace it but there a couple of things that are just a PITA. One is it SUCKS the batteries. I"m on my third replacement rechargeable. It just kicks their *** and for what it's worth, it's not all that bright. That brings me to the second thing- it seems to be getting dimmer and dimmer as life goes on. IDK, maybe I'm just comparing it to all the new lights out there. Anyway, there is a Terralux LED upgrade for around $40. I'm wondering if it's worth it and if it's reliable.