RTC Battery is low or CMOS checksum is inconsistent


When you turn on your Toshiba laptop computer you get the following message:
“RTC Battery is low or CMOS checksum is inconsistent”.


  1. Press F1. You will be taken to the BIOS menu.
  2. Press the End key. If this doesn’t work then look for the words “Save Settings” at the bottom of the screen. The key you need to press will be to the left of it.

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  1. I have the same message when I turn on the laptop – but, it won’t allow me to press the F1 Key – any suggestions?

  2. From what I read on other sites, plugging in an external usb keyboard will allow you to press the F1 button and set the date and time. Then it will load the operating system like normal. Try this.

  3. I have the same problem as stated above.I hit F1 and enter the Cmos set up.I already downloaded a CD with a a new Cmos update.I set up the priority boot to CD and saved the settings by hit END.However nothing happened and it again go back originally to message RTC battery is low or CMOS checksum is inconsistent.I am quite frustrated .Any help I will greatly appreciated.My Labtop computer is Toshiba S300M-EZ2401