Toshiba Tecra 9000 User Guide - Page 114
Charging the batteries, Running the computer on battery power - rtc battery
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114 Power Management Running the computer on battery power In addition to the main battery, you may also have a second battery installed in the SelectBay. If you travel and need to work for many hours without an AC power source, you may purchase a battery module for use in the computer's SelectBay, or carry additional charged battery packs with you. 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: For optimum DVD performance, always play DVDs while your computer is connected to AC power. Charging the batteries To charge the main battery while it is in your computer, plug the computer into a live electrical outlet. The battery charges whether the computer is on or off. The main battery light ( ) glows amber while the battery is being charged, and glows green when it is fully charged. The battery may not start charging immediately under the following conditions: ❖ The battery is extremely hot or cold. To ensure that the battery charges to its full capacity, wait until it reaches room temperature. ❖ The battery is almost completely discharged. Leave the power connected and the battery should begin charging after a few minutes. The main battery charges the RTC battery. During normal use, the main battery keeps the RTC battery adequately charged. Occasionally, the RTC battery may lose its