I found the problem with the battery life. #StraightOuttaShenzen
I souped it up a bit, adding 260mAh replacing the UN PROTECTED original cell. Do not buy no way no day.

Update: this "1 Watt" LED torch draws 0.2 watts and its lithium cell measures at 45mAh, hitting low voltage cutoff (lol there is no safety circuit here, but if there was...) after 40 minutes runtime.

ETA: It would work for less than 10mins if it really was 1W.

@Unixbigot Just out of curiousity: Isn't this tube exactly the size of AAA batteries? I wonder if that was the plan somewhere earlier along the way of designing it like this.
@szakib yes the alt text in my original pic notes that also. Lithium batteries in AAA size do exist.
@Unixbigot seems like an easy fix *if* you can find a weird 1"x1/8" shaped lipo?
@otte_homan i’m sure i can at least quadruple its runtime with just stuff from my junk box
@Unixbigot oh god is that a "laser pointer"?
@bipolaron no it’s just a ā€œ1 Wā€ LED torch which, if true, would have a battery life of about 10 mins (which is not far off what it does)
@Unixbigot ahahahahahaha that’s amazing!
@jpm no protection circuit on that lipo, either
@Unixbigot wait that tape on the top of the cell isn’t hiding a BMS IC and two MOSFETs? Oh shit oh fuck oh shit oh fuck.
@jpm nope just the bare tabs from the cell sitting next to each other almost touching with no insulation. The only thing that stops the cell sliding around inside the tube and bending those tabs together is a bit of ordinary sticky tape. *Hyperventilates* There is another one of these SOMEWHERE in my lab just waiting for the right vibration to assplode.
@Unixbigot oh that’s a disposable-vape battery!!
@Unixbigot Is it possible to daisychain several of those batteries and a voltage converter?
@csolisr cells in parallel is fine with no change to voltage.
@Unixbigot Worst. Lightsabre. Ever.
@abstractcode the unfilmed 1978 star-wars sequel novel ā€œSplinter of the Mind’s Eyeā€ has a lengthy sequence where Luke charges his Lightsaber. #IfYouKnowWhatIMean #Literally
@Unixbigot Weird euphemism for ā€œmakes out with family membersā€ but that’s really George Lucas’ fault.