I'm about to send my 2016 MacBook Pro for a top case replacement due to a failing keyboard. Since the battery will also be replaced as a part of the top case, I'm wondering if Apple installs a refurbished battery or a brand new one? And for that matter, is there any way to really tell?

marked as duplicate by Allan, nohillside Nov 28 '18 at 9:39

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Batteries are never refurbished and installed brand new. The usage status of a battery can be determined by looking at the consumed charge cycles (1 full charge and discharge constitute 1 charge cycle).

You can easily determine the battery charge cycles consumed by going to  → About This Mac → System Report... → Hardware → Power → Battery Information → Health Information → Cycle Count. It should look something like this:

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There's also an excellent 3rd party tool called coconutBattery which is very easy to use.

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