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Doc.E - the above advice is pretty much my practice on a MBPro, mainly for the reason of limiting the number of 'recharging cycles' that the battery has experienced (a complete cycle to a full recharge is counted as one, which may be done at once or over a number of partial recharge events).
Apple usually will state that their laptop batteries can go through 500-1000 complete cycles before losing about 20% of their charging capacity which would equate to 80% health. You can determine the health of your battery by bringing up a system report (use About This Mac) - see my screen capture below - my battery has gone through only 206 cycles over nearly 2 years (mainly by keeping it plugged in most of the time); the battery is currently 100% charged, so by dividing the charge remaining by the the original full charge capacity gives me 97% battery health.
NOW, of course, how you use your laptop impacts greatly on battery charging - I'm retired and pretty much limit my computer's use to my den next to my charger, so the reason for my practice; however, if you need to use your laptop most of the day in the absence of a charger, then your needs will be different - so, just keep in mind the information above on cycles. Dave

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