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User-Installable Features
Lithium ion Battery
Your LifeBook T4200 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, chemi-
cals or other hazards.
The Lithium ion battery operating time may become
shorter if it is used under the following conditions:
■When used at temperatures lower than 41° F (5° C) or
higher than 95° F (35° C). Extreme temperatures not
only reduce charging efficiency, 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.
See “Battery Charging/ Level Indicators” on page 16.
■When using a high current device such as a modem,
CD-ROM drive, or hard drive, using the AC adapter
will conserve your battery life.

RECHARGING THE BATTERY

If you want to know the condition of the 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 or Auto/Airline adapter. To recharge the
battery make sure the battery that needs to be charged is
installed in your Tablet PC and connect the AC or Auto/
Airline adapter.
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
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. See “Power
Management” on page36.
Low Battery State
When the battery is running low, your Tablet PC will
beep every 15 seconds and the Battery Level indicator
will flash. 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.
■Do not leave a faulty battery in your
Tablet PC. It may damage your AC
adapter, optional Auto/Airline adapter,
another battery or your Tablet PC itself.
It may also prevent operation of your
Tablet PC by draining all available cur-
rent into the bad battery.
■Under federal, state, or local law it may
be illegal to dispose of batteries by
putting them in the trash. Please take
care of our environment and dispose of
batteries properly. Check with your local
government authority for details
regarding recycling or disposing of old
batteries. If you cannot find this infor-
mation elsewhere, contact your support
representative at 1-800-8Fujitsu.
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 significant 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.
Make sure that the Battery Charging
indicator and the percentage charge is
shown inside the Battery Level icon on the
Status Indicator Panel.
Using heavy current devices such as a
modem or frequent CD-ROM and
PCMCIA powered external device accesses
may prevent charging completely.
■You may not be able to hear the alarm if
the volume control is set too low or is
turned off by the hardware or software.
However, you will be able to see the
Battery Level indicator flash. Once the
low battery alarm occurs you must save
all your data and put your Tablet PC into
Standby mode until you can provide a
new power source. You should provide a
charged battery or AC or Auto/Airline
Adapter as soon as possible.
■When you are in Standby mode there
must always be at least one power
source active. If you remove all power
sources while your Tablet PC is in
Standby mode, any data that has not
been saved to the hard drive will be lost.
T Series.book Page 43 Wednesday, April 25, 2007 11:29 AM