Constant power on the MBP

is there wrong leaving mbp connected mains power or (eventually) wear battery down?

 

you should use mbp on battery every once in while.

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this should answer most, if not all, of battery questions:
apple notebook battery faq by ggjstudios
the f.a.q. includes following topics:

• battery information
• battery life charge
• ac power
• calibration
• battery lifespan
• checking status , health
• charging
• what cycle?
• batteries not covered
• bulging or swelling battery

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