bad experience with Holosun RML Laser Green & Red - Green

I was trying to get a rail mounted laser that works, having failed twice with 2 other products when I bought the Holosun RML green laser from the new company Optics Force. (see my other posts about the other brands that failed)

Optics Force promptly delivered the RML green laser, I opened it and by all appearances it was of good quality (way better than the Lasermax one).

I easily mounted it and adjusted the beam to my iron sights. But there were a few related  anomaly when doing that:

#1 the detailed instructions said the battery was all ready installed, but it wasn't.

#2 when I  installed it and tried to screw the cap back on, it was very difficult to 

      line the threads up properly and screw it on.

#3 when I finally thought I had it threaded in over the battery, it never stopped 

     turning, like happens when threads are stripped.

#4 So a couple days later I took it to the range and the first time I shot it, the cap

      fell off and the battery came out.

#5 I spent a half hour at the range trying to screw the cap back on straight and

      tight WITHOUT a battery installed and could not because even though it 

      looked flat with the laser body and tight, every time I let go of it, it 

      fell back off.

Update:I finally got the cap on securely although it is really difficult and then the battery ran down right away! Apparently this thing uses juice even when it is off and there are several reviews of it as some sites attesting to this flaw.