I wouldn't hesitate using an eotech. If battery failure is such an issue, how about replacing them more often? Before they fail?
I'm partial to trijicon scopes and red dots-no battery's required. I own several. one of them took a good drop to the floor (not the gun) and still works great.plus you can still use your iron sights with the scope on the gun, there is a cut out under it for a clear view of your iron sights