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I changed my laptop battery , it is unable to show correct time and every 1 hour the time is reducing by 1 hour .
How do I fix it ?

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For : a clock that steps back exactly one hour on a regular cadence is not normal and can come from several distinct causes. 's suggestion about the little backup battery is a good lead, but it helps to isolate whether the problem is hardware (RTC/CMOS), firmware (BIOS), or software (OS time zone/sync or a scheduled task) before replacing parts.

Try this quick isolation checklist:

  • Boot into the BIOS setup, set the correct time, leave the machine idle for an hour and check the BIOS clock again. If the BIOS clock rolls back, that points to an RTC/backup battery or motherboard fault.
  • Power the laptop off, remove AC and the main battery for a minute, then power on and check BIOS time. Loss of time while fully powered down strongly suggests the RTC backup cell is not holding charge.
  • If BIOS time stays stable but the OS clock changes, disable internet time sync and any Lenovo/third-party time utilities, then watch the clock for an hour. Check the OS event log for “system time changed” events to see what process made the change.
  • Verify the OS time zone and daylight-saving settings; repeated one-hour corrections can be caused by conflicting DST/UTC settings or a script that reapplies a zone hourly. Also check scheduled tasks and power-management utilities.

Remedies and cautions:

  • If hardware is at fault, replace the RTC/CMOS backup battery following the T60 service manual and use the correct replacement part. Take basic ESD precautions or have a technician do it.
  • Update the BIOS/firmware if a vendor fix exists, and set a reliable NTP server once the root cause is fixed.
  • If the fault persists after these checks, a failing RTC circuit or motherboard fault is likely and professional repair is recommended.
Member Avatar for cguan_77

what you mean by you changed laptop battery? is it your cmos batt or what? if you haven't changed cmos battery then try changing it..

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