My Burris fixed 4X uses a 2032 type battery to light up the reticle in the dark, but even “off” the reticle is very good. As in, after all the batteries are dead, it’ll still be a good optic.
I will admit I’m softening on the 2032 battery optics. The holo sight was widely used in Iraq when I was there, so I trust it. I personally used an ACOG and loved it, but my God are they expensive! I’m looking closer at the Aimpoint T and H series now.