Also another issue I just realized after doing it again is that whenever in the morning trying to click on use item while having nothing will cause the game to freeze and crash for some odd reason.
Hi,
Camera battery at night is your stamina during the day - if you're low on stamina, you'll have low battery (it's just visual representation of your stamina value in form of a "battery" at night)
The other issue - "game freeze" is simply a bug that has been already fixed, you can find the 0.4.3.2 build on devs SubStar page and get it for free, no idea why he didn't post it here.
Cheers!