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This is just one source. I did a google search for USB wireless adapters. They are used by many users. Generally these units cost the same whether online or at the local Radio Shack, etc. because of shipping.
Caring for your Compaq Evo N400c Laptop Battery
You can improve the life of your Compaq Evo N400c Laptop Battery by doing the following: When
you first receive your laptop battery charge it fully for at least 6-8
hours and then discharge the battery fully by using your laptop
unplugged from the mains until it runs down completely.
Repeat this 3 times to ensure your Compaq Evo N400c Laptop Battery will give you the maximum performance.
you regularly use your Compaq Evo N400c Laptop on mains power for
extended periods, removing the battery from your Laptop during these
periods will extend the usable life of your laptop battery.