T3400/T3400CT Maintenance Manual
1.9.2 Battery Charging Control
Battery charging is controlled by a microprocessor mounted on the power supply. The
microprocessor turns charging on or off and detects a full charge when the AC adapter and
main battery pack are attached to the computer. The system charges the main battery pack
using quick or trickle charge.
❏ Battery Charging
When the AC adapter is attached, there are two types of charge: quick charge when the
system is powered off and trickle charge when powered on. Table 1-9 gives quick and trickle
charging time requirements.
Table 1-9 Time Required For Main Battery Charges
Charge Charging time
Quick charge About 3 hours
(power off)
Trickle charge About 8 hours
(power on)
If one of the following occurs, the quick charge process stops.
1. The main battery pack becomes fully charged.
2. The main battery pack or AC adapter is removed.
3. The main battery pack or AC adapter output voltage is abnormal.
4. The charge current is abnormal.
When the main battery pack is fully charged and the AC adapter is attached, the power supply
microprocessor changes quick charge to trickle charge.
1.9.3 Backup Battery
The backup battery maintains data for AutoResume (resume mode). The power source used
to back up AutoResume data is determined according to the following priority:
AC adapter > Main battery pack > Backup battery
The backup battery is charged by the main battery pack or AC adapter when the system is
powered on. Table 1-10 shows the charging time and data preservation period of the backup
battery.
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