pintree3 said:
Is it wise to keep a laptop always plugged in when not in use or when in use, in order to keep battery life/longevity or not?
I am believing to think this is not a smart idea me having done so.
Sadly, you did not tell us what notebook you are using, so any advice you get is just a guess!

And it is second guessing highly qualified and educated electrical engineers using highly sophisticated computer-aided design computers to design YOUR notebook and select THAT battery for YOUR notebook.
There are relatively low-tech, cheap notebooks and batteries and there are highly sophisticated, high-tech notebooks and batteries! No way the same advice applies to all. Not all notebooks are created equal. Not all batteries are the same. Not all charging circuits are the same either. Especially compared to years ago. Today's charging circuits, even in entry-level notebooks are highly intelligent, fully capable of detecting when a battery needs charging, and when it is fully charged. And when fully charged, many chargers stop charging - so no need to remove the battery - or even unplug the charger with many notebooks.
Some notebooks require the battery in circuit for the notebook to work. Some notebooks don't care if you remove the battery. I NEVER remove the battery from my 4 year old Toshiba. Why? Because my manual doesn't say to!!!! I don't even have to unplug the charger when fully charged. What I do need to do with
my specific notebook and battery is periodically allow the battery to fully discharge, then charge again. But this is NOT for extended battery life - but to ensure the battery status monitoring program is in proper sync with the actual battery status.
It is critical for EVERYONE to
RTFM for
YOUR specific notebook and see what YOUR manual says is best for YOUR notebook and YOUR battery. What may be best for mine, may not be for yours, or anyone else's.
So look in your manual! If it does not say to remove the battery, don't. It is the only expert source for proper advice concerning YOUR specific notebook and YOUR battery. Not me, or anyone else!