Looking into buying a Leupold VX5HD 3-15x44 scope and considering the Illuminated Firedot Reticle. When power is turned off on the scope does the "Firedot" go away leaving black crosshairs? What battery does it use and what battery life can I expect? Tried to find an owner's manual on line with no luck. Appreciate being able to ask such a knowledgeable group and thank each for your valued insight.