Lithium Ion Battery; Recharging The Batteries - Fujitsu LifeBook T901 Series User Manual

Lithium ion Battery

Your LifeBook T901 Series Tablet PC has a
Lithium ion battery that provides power for
operating your Tablet PC when no external
power source is available. The battery is durable
and long lasting, but should not be exposed to
extreme temperatures, high voltages, chemicals
or other hazards.
The Lithium ion battery operating time may
become shorter if it is used under the following
conditions:
• When used at temperatures that exceeds a
low of 41°F (5°C) or a high of 95°F (35°C).
Extreme temperatures not only reduce
charging effi ciency, but can also cause battery
deterioration. The Charging icon on the Status
Indicator panel will flash when you try to
charge a battery that is outside its operating
temperature range.
• When using a high current device such as
a modem, CD-ROM drive or the hard drive,
using the AC adapter will conserve your battery
life.
Do not leave a faulty battery in your Tablet
PC. It may damage your AC adapter, another
battery or your Tablet PC itself. It may also
prevent operation of your Tablet PC by
draining all available current into the bad
battery.
Actual battery life will vary based on screen
brightness, applications, features, power
management settings, battery condition
and other customer preferences. CD-ROM
drive or hard drive usage may also have a
signifi cant impact on battery life. The battery
charging capacity is reduced as the battery
ages. If your battery is running low quickly,
you should replace it with a new one.
User-Installable Features

Recharging the Batteries

If you want to know the condition of the primary
Lithium ion battery, check the Battery Level
indicator located on the Status Indicator panel. The
indicator changes as the battery level changes.
The Lithium ion battery is recharged internally
using the AC adapter. To recharge the battery
make sure the battery that needs to be charged
is installed in your Tablet PC and connect the
AC adapter.
Make sure that the Battery Charging indicator
and the percentage charge is shown inside
the Battery Level icon on the Status Indicator
Panel.
There is no memory effect on the Lithium ion
battery therefore you do not need to discharge
the battery completely before recharging. The
charge times will be signifi cantly longer if your
Tablet PC is in use while the battery is charging.
If you want to charge the battery more quickly, put
your Tablet PC into Standby mode, or turn it off
while the adapter is charging the battery.
Using heavy current devices such as Modem
or frequent CD-ROM and PCMCIA powered
external devices accesses may prevent
charging completely.
Low Battery State
When the battery is running low, your Tablet
PC will beep every 15 seconds and the Battery
Level indicator will fl ash. If you do not respond to
the low battery alarm, the batteries will continue
to discharge until they are too low to operate.
When this happens there will be a multiple beep
alarm and the Battery Level indicator will show
a dead battery. Your Tablet PC will then go into
Standby mode to try and protect your data for
as long as possible. There is no guarantee that
your data will not be lost once the Tablet PC
reaches this point.
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