Should i leave charge plug when it is fully charged?

Should i leave charge plug when it is fully charged? I read that my macbook pro with retina display (Early-2012) has 1000 charge-cycle. If i do not unplug it when it is fully charged, it won't count plus for charge-cycle. However, is it beneficial?
Thanks a lot.

You can leave it plugged in whether using it or not. It will not harm the battery:
About Batteries in Modern Apple Laptops
Apple - Batteries - Notebooks
Extending the Life of Your Laptop Battery
Apple - Batteries
MacBook and MacBook Pro- Mac reduces processor speed when battery is removed while operating from an A-C adaptor
Battery University
Apple - Batteries - iPod
Apple - Batteries - iPhone
Apple - Batteries - iPad
Apple Portables- Calibrating your computer's battery for best performance
Mac notebooks- Determining battery cycle count
How to Calibrate Your Mac, iPhone, or iPad Battery | MacBlend

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