Shows people don't read the instructions
I got one of these a couple of months ago, mainly as I'm moving my home office indoors & needed something like this to answer the door (i.e. camera not just a dumb door bell).
Anyhow, the thing is it had a warning inside the box about this exact problem & not to mix the screws up.
The security screws (which they provided the appropriate tool) is to attach it to the mounting thats screwed to the wall so it's difficult for someone to nick the door bell.
The warning clearly stated the overheating problem as the wood screws could "puncture the battery".