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@singspeed
Hey Hoefla, the LED is a CREE Q5 high quality LED that doesn't look like a regular LED. It's a tiny flat, extremely bright light on a circuit board.
The battery compartment comes out, and you put the batteries in so that the spring side of each battery gap touches the negative contact of the battery (the flat end).
Let me know if you are still having trouble.
TS, sorry to hear that, the batteries can jiggle depending on the variability of the thickness of different AAA batteries causing the light to go a bit awkward over bumps. You can put a bit of folded paper in the compartment to stop them jiggling around over bumps etc.