[danielh]

The difference is that a phone might get hot when the camera is running 24/7 and CPU load is high, e.g. due to motion detection.

To add some anecdata: I had an old iPhone (IIRC a 4s) running as security cam for about 6 weeks. When I returned, the case was cracked due to a swollen battery.

[gambiting]

....and? I imagine the phone shut down and literally nothing happened? Batteries are kind of designed to do that in case of cell failure, actual fires are incredibly rare.

[rmuratov]

Care to elaborate your software setup?