Funny, I came here to post about battery life on the Mdads. The first one I got seemed defective as no battery, new or the included would allow brightness to get above 3 without removing the battery cover to "reset" it. I filed a claim and PA sent out a new one on or around 6/6/16. When I first got it all was well and I could cycle through all brightness settings.
I just went out to my safe to check on everything and found the dot to be a little dim. I thought maybe I had turned it down, but it seems the battery is almost dead as it won't cycle higher than setting 3. Is it possible I received two defective units back to back, or could this be a battery problem? I'm dissapointed in these optics so far but, PA's customer service has been top notch. It's just a PITA having to return things.
Let me know PA.