So I am most interested in the AA/AAA vs. rechargeable part of the discussion. It happens that my headlamps are all AAA either a single battery or several. They work for me and my logistics.

I've looked several times at going for rechargeable but always find myself defaulting to the simple one use battery. My logic always ties to being able to have it work and work right now. With rechargeable I have to spend time charging it but with aa/aaa I just swap out and it's back to business.

I do have flashlights that use rechargeable but I got them as they could also use CR123 if needed so once again, battery and go with no recharge time. I seem to never need that option but I like having it there. Thanks for this interesting discussion.