Here's an update on this optic:
PA claims a battery life of "up to" 50,000 hours. Hmmm, maybe not.
I started this thread on 7 Feb, the day after I got the optic. I put the date I installed the battery, 6 Feb 2015, on the sight. Yesterday I picked up the sight to show a friend, lo and behold the sight is dead.
I took a battery out of a different optic, installed in the this one and it worked. So, I'm sure the battery just died. I'm very disappointed that it lasted less than 6 months when it should last at least 5 years.
Now, the battery in it was the one it came with from Primary Arms. Maybe it was worn out when I got it? I don't know. I will send a note to Primary Arms about it and install a new battery. Time will tell if it works. At the moment, I'm very disappointed. Any sight that will be used for serious defense cannot have the battery die this quickly.