Chosen Solution
After LG G5 battery swap and reboot, device time is wrong
Assumed: LG G5 phone, Android 8.0/Oreo (latest supported release), 2 batteries1 Shut down phone2 Swap battery3 Reboot4 Observe: time is wrong5 Log in6 Status bar upper right > Settings7 Scroll to bottom8 Tap System (2nd-to-last item)9 Select Date & Time (3rd item)10 If “Set automatically” on, uncheck11 Check “Set automatically” - time now correct