Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 196

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In North America, dispose of nickel metal hydride or lithium-
ion batteries by taking advantage of the Compaq battery
recycling program. You will be provided with a postage-paid
battery pack mailer preaddressed to a reclamation facility where
the metals are recycled.
In Europe, do not dispose of batteries with general household
waste. Dispose of or recycle them by using the public collection
system or returning them to Compaq, your authorized Compaq
Partners, or their agents.
Line switching allows the computer to operate from either a
100-120V or 220-240V input line.
The power cord set (power cord) you received with your
computer meets the requirements of the country where you
purchased the system. If you use the computer in another
country, you must use a power cord that meets the requirements
of that country. For more information on power cord set
requirements, contact your Compaq authorized dealer, reseller,
or service provider. The following information explains the
requirements for power cord set selection:
1. The cord set must be approved for the country where it will
be used.