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Battery type Sleep Mode Shut Down Mode
Battery pack
(54Wh, 4cell)
3.6 days 65 days
RTC battery about 30 days about 30 days
Extending battery life
To maximize the life of your battery packs:
At least once a month, disconnect the computer from a power source
and operate it on battery power until the battery pack fully discharges.
Before doing so, follow the steps as detailed below.
1. Turn off the computer's power.
2. Disconnect the AC adaptor and turn on the computer's power - if it
does not turn on then go to Step 4.
3. Operate the computer on battery power for five minutes. If you find
that the battery pack has at least five minutes of operating time,
continue operating until the battery pack is fully discharged, however, if
the DC IN/Battery indicator flashes or there is some other warning to
indicate a low battery condition, go to Step 4.
4. Connect the AC adaptor to the DC IN 19V jack of the computer, and
to a wall outlet that is supplying power. The DC IN/Battery indicator
should glow amber to indicate that the battery pack is being charged,
however, in the event that DC IN/Battery indicator does not glow this
indicates that power is not being supplied - check the connections for
the AC adaptor and the power cord.
5. Charge the battery pack until the DC IN/Battery indicator glows
white.
Peripheral devices
Memory media
The computer is equipped with a Memory media slot that can
accommodate some kinds of memory media with various memory
capacities so that you can easily transfer data from devices, such as digital
cameras and Personal Digital Assistants.
Keep foreign objects out of the Memory media slot. Never allow metal
objects, such as screws, staples and paper clips, to enter the Memory
media slot. Foreign metal objects can create a short circuit, which can
cause computer damage and fire, possibly resulting in serious injury.
Satellite U840W series
User's Manual 4-16