Ultrafire flickering & dimming problems

[Firescooby]

I've got several Ultrafire lights (one and two cell 18650) lights I got from DX. All have had problems with flickering, intermittent dimming, etc. I've tightened the ends where the battery spring thing is and tried sanding the interior of the tube.

Anything else to try/ look at?

Thanks

 

[Rossymeister]

Perhaps A Good Cleaning Of The Contact Points Would Solve The Problem.

Or It Possibly Could Be Bad Solder Joints.

Basically, You Get What You Pay For

 

[Marduke]

interior of the tube?

Try cleaning the contact points with an alcohol swab. That means the PCB and the ENDS of the rube (not inside).

 

[qwertyydude]

I also take apart the switch and spray some wd-40 on the mechanism and give it a bunch of clicks, helps keep the contacts clean. Oh yeah make sure there's no crud on your batteries too.