I believe the following steps take place: When the Magsafe connector is plugged into a Mac, a lot more happens than you might expect. Charging is basically negotiated between the adapter and the computer. This website explains in more detail how Magsafe works. Please only proceed if you have the necessary technical expertise:Īs a next step you may want to measure if there is a current on the center pin. This answer elaborates on the pin configuration that is necessary to charge the computer further.Īs the Apple support document states, I suggest you closely inspect the pins on your adapter and the contacts on your MacBook. In this Apple support document it is described that a missing contact on the center pin may cause the adapter not to charge the computer. I would suspect something is wrong with the center pin of either your MacBook or your power adapter. Any reputable retailer will be willing to test/replace the battery in this situation. If so, I would be speaking to Apple (or the 3rd party vendor) from whom you bought the battery as it is possible it's an EEOL (Early End Of Life) situation. Once you've done that, let me know what happens.īased on your question, your battery has only done 27 cycles, so I'm assuming you've only recently bought this battery. This will try and run diagnostics from the internet instead, so you will need to allow more time for it to complete. Note 2: If pressing and holding the D key at Step 3 doesn't work, start again at Step 1 and, at Step 3 press and hold both the Option D keys instead. Take a note of the results and report back. Note 1: that the extended test will take some time. Your test results will appear in the window in the bottom-right of the console.However, I suggest you select the "Perform extended testing" checkbox before you click the Test button. When the AHT console appears, you can choose to run Basic tests by clicking the Test button.When prompted, select your language and click the right arrow.After a while, Apple Hardware Test (AHT) will start.Press and hold the D key before the gray startup screen appears.
Once you've done that, and assuming it has no effect, you'd want to run Apple Hardware Test. Read through this page carefully as the instructions differ for different models of Mac.
#BATTERY FOR MAC BOOK PRO RETINA 2012 HOW TO#
Of course, when you're trying to do things yourself, that isn't so easy.Įven though you've reset the SMC, I'd do that again first and ensure you refer to How to reset the System Management Controller (SMC) on your Mac on Apple's website. testing the battery in another 2012 MBP, testing the AC charger with another MBP, and so on). In this situation, if you've already reset the SMC (and it may be worth doing again, ensuring you've followed the correct steps for your model), you'd normally want to isolate the different components by testing them separately (e.g. Go in from the sides under each battery cell one at a time, don't go in from the top and bottom as you could easily damage the keyboard and trackkpad cable.Troubleshooting is a process of elimination and often requires patience. Removing the old battery requies a large amount of constant physical force to get under the adhesive of each cell so it is advised to remove the logic board before doing this incase you slip and hit the logic board. If you do decide to replace the battery with a generic one then as others have mentioned check out guides to see if you think it is something you would attempt and get your self some plastic scrappers like these on ebay (NOT the liquid just the plastic scrappers) About 20% of the generic batteries that we order arrive with a fault or just arent that good quality so they take much longer to charge or last only about 70% of the time an official Apple battery would last. I work for an Apple Authorised Service Provider and sometimes we have to get generic batteries if Apple no longer supply a battery for that model. Apple batteries are of such higher quality, they last longer and almost never fail out of the box. If you can afford Apple to replace the battery then my advice would be to get Apple to replace it, they replace the whole top case with keyboard/trackpad/battery.
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