I'm a desktop user, but have recently needed a laptop.
So I did some research.
1. Plug in whenever possible
http://www.pcworld.com/article/2042236/five-surefire-ways-to-maximize-your-laptops-battery-life.htmlHaving a battery fully charged and the laptop plugged in is not harmful, because as soon as the charge level reaches 100% the battery stops receiving charging energy and this energy is bypassed directly to the power supply system of the laptop.
However there’s a disadvantage in keeping the battery in its socket when the laptop is plugged in, but only if it’s currently suffering from excessive heating caused by the laptop hardware.
http://www.howtogeek.com/124715/should-i-leave-my-laptop-plugged-in-all-the-time/The battery for this laptop obviously will not be damaged since the hardware doesn't run anywhere hot enough to damage the battery.
Thanks for the info it was very helpful.