Why the battery allways discharges 3% volume per night?

why the battery allways discharges 3% volume per night when the kit shut down and AC adaper power off?X220 with W7 or W8 as the same problem. All of peripherals are disconnected. If battery disconnect, not discharge.
Thanks!

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also
http://theweek.com/article/index/250098/ios-7-battery-life-6-simple-ways-to-keep -your-iphone-powered-up
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The article linked below provides a lot of great troubleshooting tips that can help you resolve the issue with your iPod nano charging or displaying a blank black screen.
iPod nano (7th generation): Hardware troubleshooting - Apple Support
So long,
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Why the battery allways discharges 3% volume per night?

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