I think I had mention my concern somewhere else on the CF about the possibility of batteries corroding in their compartment.
Do batteries still do that? I remember leaving batteries in old flashlights and forgetting all about them. Then the time comes when you need the flashlight and it doesn't work. You open it up to check the batteries only to find corrosion and a ruined light.
I haven't put batteries in either of my lenses. Maybe someday I will just to see what they look like when the bulb is lit. Right now my lenses are NBL (never been lit).
Light them if you must but don't leave the batteries in for weeks and risk damaging your prized possession.
Bob