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1.6 Batteries 1 Hardware Overview
NOTES
1. The time required for normal charge is affected by the amount of power the system
is consuming. Use of the fluorescent lamp and frequent disk access diverts power
and lengthens the charge time.
2. Using quick charge, the power supply microprocessor automatically stops the
charge after eight hours regardless of the condition of the battery. Overcharging
could cause the battery to explode.
If any of the following occurs, the battery quick charge process stops.
1. The battery becomes fully charged.
2. The AC adaptor or battery is removed.
3. The battery or output voltage is abnormal.
4. The battery temperature is abnormal.
5. The battery SMBus communication fails.
6. The battery cell is bad.
Detection of full charge
A full charge is detected from the battery pack through SMBus when the battery is
charging.
1.6.2 RTC battery
The RTC battery provides power to keep the current date, time and other setup information in
memory while the computer is turned off. The table below lists the charging time and data
preservation period of the RTC battery. The RTC battery is charged by the adaptor or main
battery, while the computer is powered on.
Status Time
Charging Time (power on) About 48 hours
Data preservation period (full charge) 2 month
Satellite P30 Series Maintenance Manual 1-19