I'm thinking about getting a new emergency headtorch. I've got a few 18650 torches that I take for regular use, but what I want is something that will sit in the bottom of my rucksack for months and then be reliably useful when I need it, so rechargable li-ion batteries are probably out.
I've got a older BD storm that I've always used for this before. Unfortunately it's become a bit unreliable - sometimes it doesn't switch on and sometimes needs some jiggling about to work. If I can't trust it to work it's not fit for purpose.
I'm not interested in a petzl e-lite or similar, unless they're much better than they used to be, because they're just not bright enough. I think ideally it should be able to put out at least 300-400 lumens for 2 to 3 hours. I also want to be able to carry a spare set of batteries and for it to be cold-weather-proof, so in theory at least I think AAA non-rechargable lithium are the best option, but I'm prepared to be persuaded otherwise.