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UltraFire

WF-501B CREE Q5 5-Mode 230-Lumen LED Flashlight (1*18650)

Digg(127) ( 2 Reviews)
       
US $12.39
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· Orders over USD$ 50.00 will get free tracking services via air mail

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Product FAQs
  • Why does the rubber on my flashlight smell smokey and how can I get rid of the odor?
  • This is what I would try: scrub it with baking soda, then let it sit, still covered in it for a day or so. Baking soda is great at absorbing odors, and should not damage it in any way. Just don't let any of it accidentally get into the battery compartment. If that doesn't do it, then it may just be the chemicals used in making the rubber itself, and you may just be stuck with it. Good luck.

  • What is the temperature of a flashlight bulb filament when turned on?
  • I would try this. Calculate rated resistance using E = IR (solve for R). Assume that the increase in resistance for tungsten is linear (in the range of interest). Form a ratio of room temperature resistance / room temperature in degrees Kelvin (use absolute temperature) = rated resistance / unknown temperature x. Convert x to degrees C. Good luck.

  • How do I remove corroded and swollen batteries from a flashlight?
  • A small flashlight that takes doubles As is hardly worth the hassle, unless it's a mag-lite. If it is a mag-lite, unscrew and remove the butt cap, then unscrew and remove the head assembly. Now you are basically left with an open ended cylinder with the batteries stuck inside. Spray some wd-40 in both ends, let sit a few minutes, then push the batteries out with a flathead screwdriver. Once the batteries are out, use a stiff bristle brush (like a baby bottle brush) and wd-40 to thoroughly clean the interior of the flashlight, springs, and contacts.
    If it's a cheap plastic flashlight that only opens at the head, you can drill a small hole in the butt-end and use the same method as above.

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