My Fenix L2D Premium Q5 has stopped working. Sadly, I only got to use it a few times despite having had it for a couple years. I've read a lot of the troubleshooting tips from other people on this forum and others. I have stood a pair of AA's on the LED portion of the light and jumpered around them and the light works. So the problem must be in the tailcap, the switch, or the associated electrical connections of the body parts. I haven't found a disassembly photo of this particular light but everyone makes it sound like the tailcap should come off. For the life of me I can't get that @#$@% tailcap off. It sure seems like it is part of the light. I've wrapped the thing in protectant paper and tried twisting on it with a couple wrenches and still can't get it to budge. Can someone confirm for me that the tailcap does really does come off? If it doesn't then I'll stop twisting on it.
I noticed some slight corrosion when I took the top part of the light off to replace the batteries when I thought they were dead. I'm wondering if maybe the tailcap should come off but is so corroded that it does not conduct and has sealed itself on.
I needed this light last night and it didn't work. I'm bummed. And it wasn't cheap. I'll be even more disappointed if I have to throw away an expensive LED just because a cheap switch failed.
While I'm posting, I read that alkaline batteries are not the preferred cell for these lights due to leakage issues. Unfortunately, that's what I've been using. But the cells I removed were pristine. None have ever leaked in this light. But what are the preferred batteries for these lights?