Toshiba Satellite L20-S310TD Satellite L20-L25 User's Guide (PDF) - Page 108
Power management, contact Toshiba's Global Support Centre.
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108 Mobile Computing Running the computer on battery power NOTE For optimum DVD performance, Toshiba recommends that you play DVDs while running on AC power rather than on battery power. The computer also has an internal real-time-clock (RTC) battery. The RTC battery powers the RTC memory that stores your system configuration settings and the current time and date information. It maintains this information for up to a month while the computer is turned off. TECHNICAL NOTE: The RTC battery does not charge while the computer is turned off, even when AC power is attached. The RTC battery charges when the computer is powered on. Power management Your computer ships with the power management options preset to a configuration that will provide the most stable operating environment and optimum system performance for both AC power and battery modes. Changes to these settings may result in system performance or stability issues. Users who are not completely familiar with the power management component of the system should use the preset configuration. For assistance with setup changes, contact Toshiba's Global Support Centre.