r/PNW_Nightvision

Ive got the chance to buy that set for cheap, like cheaper than geting a fake, they are mostly for the aesthetic really.

My questions are:

1. are they upgradeable in any way? ,saw someone power them with a 11v lipo
2. are they completly unusable without an ir illuminator, like can they still be used in low visi conditions like a full moon etc.
3. will a bright flashlight aimed at me break them?
4. If i put a protective glass over the lens will I still be able to see?
5. Pic for refrence
6. any other advice would be useful.