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6-9
Charging time (hours)
Battery type Power on Power off
Battery pack 3600mAh 3.5 to 9 or longer about 2.6
4400mAh 4 to 11 or longer about 2.6
RTC battery 8 Doesn’t charge
NOTE: The charging time when the computer is on is affected by ambient
temperature, the temperature of the computer and how you use the
computer. If you make heavy use of external devices, for example, the
battery might scarcely charge at all during operation. Refer also to the
section Maximizing battery operating time.
Battery charging notice
The battery may not charge right away 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, charge the
battery at room temperature of 10° to 30°C (50° to 88°F).
❑ The battery is nearly completely discharged. Leave the universal AC adaptor
connected for a few minutes and the battery should begin charging.
The Battery indicator may show a rapid decrease in battery operating time when
you try to charge a battery under the following conditions:
❑ The battery has not been used for a long time.
❑ The battery has completely discharged and been left in the computer for a long
time.
❑ A cool battery is installed in a warm computer.
In such case, follow the steps below.
1. Fully discharge the battery by leaving it in the computer with the power on
until the power automatically shuts off.
2. Plug in the universal AC adaptor.
3. Charge the battery until the Battery indicator glows green.
Repeat these steps two or three times until the battery recovers normal capacity.
NOTE: Leaving the universal AC adaptor connected will shorten battery
life. At least once a month, run the computer on battery power until the
battery is fully discharged, then recharge the battery.
Care and use of the battery pack