You can find Ravin Crossbows contact information linked below:
https://ravincrossbows.com/support/#contact-us
I recommend contacting the manufacturer for a replacement battery cover for the Ravin Illuminated Scope R170.
Here is the manual https://ravincrossbows.com/wp-content/uploads/2018/04/RavinR9-15SeriesManual.pdf It will be under section 9 page 20
This weighs 23.84oz.
The dial on the left side of the scope (as you look through it) controls the illumination.
Unfortunately the manufacturer has not provided that information, even on their own site. We recommend contacting them directly, they should be able to provide you with that information. You can reach them here: https://ravincrossbows.com/about/contact-us/
The turret that adjusts brightness also holds the battery.
The reticle is pictured and it is etched into the glass.
No, while it has arrow drop markings, it does not have a ranging reticle.
The scope uses a CR2032 battery.