Sony fixed the looming PS4 CMOS battery issue with firmware 9.00
PlayStation has fixed the console bricking CMOS battery issue - MSPoweruser
Looks like the PS4 CMOS Battery issue has been fixed with a firmware update | VG247
PS4's latest system update reportedly stops it losing functionality when the CMOS battery dies | VGC
Sony is Reportedly Looking Into The Reported PS5 and PS4 CMOS Issues
Sony has quietly fixed PlayStation 4's dead battery issue | Eurogamer.net
A dead or drained internal battery will not render Sony PlayStation 4 unable to play offline games: Firmware update patches CBOMB issue – The Tech Herald