T2150 Series
1.10.3 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 when the system is
powered on. Table 1-11 shows the charging time and data preservation period of the backup
battery.
Table 1-11 Backup battery charging/data preservation time
Time
Charging Time Power On 20 H
Power Off (with AC power) 20 H
Power Off (Without AC power) Doesn’t charge
Data preservation period (full charge) 5 H
1.10.4 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. Table 1-12 shows the charging time and data
preservation period of the RTC battery.
Table 1-11 RTC battery charging/data preservation time
Time
Charging Time With AC power 48 H
or main battery
Data preservation period (full charge) 1 month
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