If the PC is running with out being shut down you shouldnt loose time. The battery keeps the time when the system doent have power. If you do se a time lose it should be no more than a few minutes over several weeks if PC stays powered on.
If it is the PC you've repaired, it could be the mother / systems board has a faulty clock chip. This would be a board replacement.
If you have it networked it could be getting time from a network Time Protacal (NTP) device, just onther PC or server in the office. This would mean your problem is on the primary system that distribute time on the network. This is normaly a what called an Active Directory server.
You may try disabling the windows time service, to ensure it's not getting times from another PC on the workgroup.
Alternatively you could also configure the network time service to update the time from one of the public NTP servers on the web, if you have Internet access on this machine.
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