Blogshoot in West Virginia.
Learned several things that I will be detailing this week.
The first is a simple: Batteries
Make sure you always have extra batteries for your EOTech scopes. Even if you don't need them.
By the way, if the last place you were shooting was indoors your unit may be adjusted so low that you may just think that your batteries are dead when in actually they are just fine.
--I have only made that mistake three or four times...