Does chargeing overnight diminish battery life?

I charge my iPad 2 overnight every few days when the battery dies and I notice the battery doesnt stay on 100% as long as it does when I unplug it after it completes a charge, but i notice when I charge over night it stays on a certain percent for a long time unlike when i unplug it right away. It's the same thing with my iPhone 4s. Does this diminish battery life? Or does it do nothing and it's all in my head?

I charge my iPad battery every single night and I did the same thing with my first iPad - the original model iPad which still gets about 10 hours a day out of a full charge. You are not diminishing the battery life.
You can read Apple's information about the iPad battery.
http://www.apple.com/batteries/ipad.html

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