1-18 110 Series
1.9.2 Backup Battery
The backup battery maintains data for AutoResume. The power source used to back up the
AutoResume data is determined according to the following priority:
AC power > Main battery > Backup battery
The backup battery is charged by the main battery or AC power cord. Table 1-10 shows the
backup battery's charging time and data preservation period.
Table 1-10 Backup battery charging/data preservation time
Item Time
Charging Time Power On 20 hours
Power Off (with AC power) 20 hours
Power Off (without AC power) Does not charge
Data preservation period (full charge) 4 hours
1.9.3 Real Time Clock (RTC) Battery
The RTC battery provides power to keep the current date, time, and other setup information
in memory while the computer is off. Table 1-11 shows the RTC battery's charging time and
data preservation period.
Table 1-11 RTC battery charging/data preservation time
Item Time
Charging Time With AC power 48 hours
or main battery
Data preservation period (full charge) 1 month
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