... that is common knowledge. Steill there are posts, asking for them, popping up from time to time.
Usually the argueing is about the wind-up mechansim (which is also true) but the main "problem" imho was the battery.
now, some 2-3 years ago, a friend of mine did some "remote-type" raft trip and asked me what light to get.
I did tell him all the arguments against the wind-up junk, but he still decided to get one.
That weekend we did a hike and this time he was the one to drive to the starting point.
In the car I found that wind-up 3 led light - he has ist there for emergency areason, thinking anything with a battery is not that safe; that such a light wont work when needed.
Of course I played with the wind-up
to make it short:
the mechanism worked good, but there was no way to get any light from the led.
Else the electronics, but most likely the battery - whatever chemistry they are - is dead.
Any medium quality lithium powered light would have worked, no matter what.
thats my personal experience now, with what I already knew in theory ...
PS: during that trip, the light was exactly what he wanted and perfectly worked for him