No0o0o0o! I put the battery the right way as I watched a video about it before and it already had a flickering problem, so I tried to flip it the other way to see if I was doing it wrong but it's the laser itself I'm sure... I think QC has gotten worse as my first laser from them had the same problem that developed over time from the tailcap.
Woah let me see if I got this right.
You put the battery in the laser.
You turn it on.
And it works, but flickers a little, maybe output not to standard. However there IS some output.
Then, even contrary to the video you watched, you decided that the best way to fix the problem with flichering laser, is to flip the battery backwards?!
Dude, seriously, what the hell? I mean I can understand when somebody doesn't know electronics or tech but that's just plain old common sense! If there output? Yes? Battery is in the correct way and problem is somewhere else.
In any event, regardless if the laser flickered or not when you got it, you STILL did power it with polarity inversed and cannot prove that the damage was, in fact, caused by you. I believe you personally, (benefit of the doubt thing), but seller will not.
Tighten down the retainer ring on the tailcap, clean up the battery and laser contacts, use extra spacer for firmer contact, use FRESHLY charged battery, and hope for the best.