N95 Battery drains when plugged into PC

When I'm working I have my N95 plugged into my PC but, I have found that my battery drains quicker than when it's not connected to the pc.
Can anyone explain why this is or, do I have a problem with my N95?
Regards,
Jono

Isn't it also accessing the external drive as well, thus taking CPU cycles, thus draining the battery? As the USB does not charge but provides signaling from the phone to the PC via the USB it would be safe to assume that the power drain is simply from the constant communication.
Show the KUDOS button some love.... Hit that bad boy.... It don't hurt....
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Retina MacBook Pro, iPad Mini, Nikon D4

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http://support.apple.com/kb/HT4327
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How to Calibrate Your Mac, iPhone, or iPad Battery
http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/
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Tips About Charging for New iPad 3
http://goodscool-electronics.blogspot.com/2012/04/tips-about-charging-for-new-ip ad-3.html
How to Save and Prolong the battery life of your new ipad
https://discussions.apple.com/thread/4480944?tstart=0
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iPhone, iPod, Using the iPad Charger
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Install and use Battery Doctor HD
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Your battery is dead. You will have to replace it see article:
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIs and corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
After at least 30 minutes, if:
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The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
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N95 Battery drains when plugged into PC

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