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Aug 26, 2015 11:22 AM in response to jl1997by OGELTHORPE,You may charge the MBP any time you want, using it or not. It makes no difference what order you connect the charger
This Apple support article will give you some good information on batteries and their use:
https://support.apple.com/en-us/HT204054
I have two golden rules: Never drain the battery completely where it shuts the MBP off. That shortens the battery life. When you get the low battery warning, terminate the session and connect to AC.
If you use the MBP connected to AC all the time, at least once per month, disconnect from the AC and run the MBP under battery alone to about the 40 % charge level. Then reconnect to AC, Lithium ion batteries require periodic 'exercise' in order to maintain their health and prolong its useful life.
Ciao.