dead battery in desktop pc (sync pc time)

I knew I should replace it with new one to get its date & time running.
Or run the script every time the pc boots up:


type c:\lastdate | date
echo 08:30:00 | time
w32tm /resync
echo %date% > c:\lastdate





update the windows registry:

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config]
"MaxNegPhaseCorrection"=dword:ffffffff
"MaxPosPhaseCorrection"=dword:ffffffff