Toshiba NB520 - Manual (Page 88)

Charging the batteries
When the power in the battery pack becomes low, the DC IN/Battery
indicator will flash amber to indicate that only a few minutes of battery
power remain. If you continue to use the computer while the DC IN/Battery
indicator flashes, the computer will enable Hibernation Mode so that you do
not lose any data, and automatically turn itself off.
You must recharge a battery pack when it becomes discharged.
Procedures
To recharge a battery pack while it is installed in the computer, connect the
AC adaptor to the DC IN 19V jack and plug the other end into a working
outlet - the DC IN/Battery indicator will glow amber while the battery is
being charged.
Use only the computer connected to an AC power source or optional
TOSHIBA Battery charger to charge the battery pack. Never attempt to
charge the battery pack with any other charger.
Charging Time
The following table shows the approximate time required to fully charge a
discharged battery.
Charging Time (hours)
Battery type Power off Power on
Battery pack (24Wh,
3cell) about 4 hours about 12 hours
Battery pack (48Wh,
6cell) about 5 hours about 12 hours
Battery pack (61Wh,
6cell) about 6 hours about 12 hours
RTC battery doesn't charge doesn't charge
Battery charging notice
The battery may not begin charging immediately under the following
conditions:
The battery is extremely hot or cold (if the battery is extremely hot, it
might not charge at all). To ensure the battery charges to its full
capacity, you should charge it at room temperature of between 5°C to
35°C (41°F to 95°F).
NB520 series
User's Manual 5-5