Toshiba User's Guide for Satellite L305/L305D Series
Page 108
... to a month when the computer is powered off. 108 Mobile Computing Charging batteries HINT: Once the battery is fully charged, we recommend that you to reset the real-time clock. The RTC battery powers the System Time Clock and BIOS memory used to charge the RTC battery because it maintains this... may display the incorrect time and date, or stop working . If the RTC battery is seldom necessary to store your computer was shipped, resulting in a CMOS error message during startup.
... to a month when the computer is powered off. 108 Mobile Computing Charging batteries HINT: Once the battery is fully charged, we recommend that you to reset the real-time clock. The RTC battery powers the System Time Clock and BIOS memory used to charge the RTC battery because it maintains this... may display the incorrect time and date, or stop working . If the RTC battery is seldom necessary to store your computer was shipped, resulting in a CMOS error message during startup.