Several months ago I reviewed a LED flashlight that used a magnet
sliding through a coil to generat electricity. There were posts that
stated that some Chinese LED flashlights on the market were fakes using
button cells that could not be recharged. The moving slug was just put
in to look good. The one I bought from PRO Hardware was legitimate and
has worked perfectly for three months with very little charging
required. One way to identify a good moving-magnet flashlight is to
put it near some paper clips or such. The magnet is so powerful that
the clips will jump at the flashlight and stick to the side. The
flashlight in question is 7 inches long is made of clear plastic and
has a black ring at the front. It is PRO Hardware number 736N5950. I
imagine that there are lots of them around and they would make good
stocking-stuffers for those of the Kris Kringle persuasion (not that
there's anything wrong with that).