Ok, I got a Nitecore NU05v1 kit (light + headband + bike clamp) super cheap on closeout. This light weighs 10.4g if I remember right, another 9g or so for the included headband, but you could instead do a shock cord headband of 3g or so.
Unfortunately, the light didn't work when I got it: the internal lipo battery was dead. The seller offered me a refund or replacement but I figured heck, I wanted to open it up anyway, so I'd see if a DIY fix was feasible. Spoiler: I'd say it's not feasible.
Instead of screws, the light was heat staked and glued together, so I had to pry it apart with a knife. The battery is also glued to a foam pad inside, and it's an obscure size. I need to measure it but by eyeball it's around 27mm * 27mm * 4mm. Maybe I could order a replacement cell from somewhere and reassemble the light, but this is all a pretty big hassle. These lights new are about $20 each and I can't recommend buying one unless you absolutely require the form factor and don't mind throwing it away when the battery craps out.
The larger Nitecore lipo lights aren't as bad. There's a box you can pry open and the parts aren't so packed inside. Here's a youtube about replacing an NU25 battery:
https://www.youtube.com/watch?v=KnSQir2u_nAOverall though, I wouldn't buy one of those models either. I'd stick with the 14500/AA powered HA11 or HA15. All up (including battery and headband) they're still in the 2 ounce range, which is pretty lightweight by most standards.
Anyway I had been intrigued by the NU05 for a long time and now my curiosity is mostly satisfied. It's a clever design and a technical feat, but the non-serviceability is a big negative.
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