PS4’s CMOS Battery
Last month, a Twitter account called 'Does It Play'highlighted the PS4 clock battery death, which a Twitter user later confirmed.
The user purchased a PS4 slim and removed the CMOS battery to test it out. He found that he could not play any physical or digital games offline without connecting to Sony's server.
If Sony chose to close the PlayStation Network in the future, it would theoretically lead to over 115 million PS4 consoles eventually being unable to play games. However, it is expected that Sony will oversee this issue in a future firmware update.
It is to be noted that this clock error occurs because trophies on PS4 require an internal system.
Apart from that, Does It Play confirmed the fact that PS3 and PSVita also appear to improve an internal clock's accuracy to verify access to digital content?