79Mobile ComputingMonitoring battery powerDepending on your system, the RTC battery may onlycharge while the computer is turned on.To recharge the RTC battery, plug the computer into a liveelectrical outlet and leave the computer powered on for 24hours.It is seldom necessary to charge the RTC batterybecause it charges while the computer is on. If the RTCbattery is low, the real-time clock and calendar maydisplay the incorrect time and date or stop working.When the RTC battery is completely discharged, awarning prompts you to reset the real-time clock.The computer can be used while the RTC battery is beingcharged, although the charging status of the RTC batterycannot be monitored.Monitoring battery powerTo locate your system indicator lights, please refer to yourQuick Start document.The computer’s main battery light gives you an indication ofthe main battery’s current charge.❖ Glows amber while the main battery is being charged(AC adaptor connected)❖ Glows white when the main battery is fully chargedBattery life and charge time may vary, depending uponpower management settings, applications and featuresused.❖ Flashes amber when the main battery charge is low andit is time to recharge the main battery or plug in the ACadaptorNOTENOTENOTENOTE