Dell Dimension XPS 50 Reference Manual page 177

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Your computer system uses a lithium-ion battery. The lithium-ion battery is a long-life
battery, and it is very possible that you will never need to replace it. However, should
you need to replace it, refer to the section about replacing the battery in your Dell sys-
tem documentation for instructions.
Do not dispose of the battery along with household waste. Contact your local waste
disposal agency for the address of the nearest battery deposit site.
This device belongs to Class B devices as described in EN 55022, unless it is spe-
cifically stated that it is a Class A device on the specification label. The following
applies to devices in Class A of EN 55022 (radius of protection up to 30 meters).
The user of the device is obliged to take all steps necessary to remove sources of
interference to telecommunication or other devices.

                    
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Most Dell computer systems are classified by the Voluntary Control Council for Inter-
ference (VCCI) as Class B information technology equipment (ITE). However, the
inclusion of certain options can change the rating of some configurations to Class A.
ITE, including peripherals, expansion cards, printers, input/output (I/O) devices, moni-
tors, and so on, integrated into or connected to the system, should match the
electromagnetic environment classification (Class A or B) of the computer system.
To determine which classification applies to your computer system, examine the regu-
latory labels/markings (see Figures D-1 and D-2) located on the bottom or back panel
of your computer. Once you have determined your system's VCCI classification, read
the appropriate VCCI notice.
Regulatory Notices D-5