Wolf-Eyes Raider battery issue

I’ve had a WE Raider for 5 or 6 years and have mainly used cr123 batteries. I used 18500 for a short time, until one battery sh!t the bed on me (don’t remember the brand). I picked up some Ultrafire protected 18500s and charged them up in my XTAR charger, and they don’t work. Cr123s still work. Any ideas why, or any corrective action I can take? I know Ultrafire quality is suspect, but it’s an old incan light and I didn’t want to spend much on batteries.

Have you tried removing the tailcap and using a piece of wire to go from the back of the battery to the battery tube?

I have not. Can you explain a little further for me? I’m not sure I understand. It is 2 batteries, by the way. Sorry for being a bit slow on the uptake, and thanks for your help.

Sure, simply remove the tailcap and place the batteries in it. Then take a piece of wire and go from the back of the battery to the battery tube. If it turns on the it is a connection issue. If you want I can take pictures and post them up.

Thanks scaru. If you wouldn’t mind, I’d like to see some pictures. Thanks again.