what is a rtc battery
Home / Hardware / Toshiba Laptop / RTC Battery is low or CMOS checksum is inconsistent. When you turn on your Toshiba laptop computer you get the following message: âRTC Battery is low or CMOS checksum is inconsistentâ. 1  Press F1. You will be taken to the BIOS menu.  Press the End key. If this doesnât work then look for the words âSave Settingsâ at the bottom of the screen. The key you need to press will be to the left of it.