An epilogue of sorts to https://www.macrumors.com/2017/07/24/mid-2012-macbook-pro-top-case-battery-constraint/ [I'm based in the UK, so so not sure if this is worldwide] Went to a Genius Bar appointment yesterday with the purpose of replacing my 2012 MBP battery, which has been saying "Replace Soon" for the best part of six months. Mindful of the fact that I'd missed the boat on the "deal" above, I was expecting to pay around £200 and be without my MBP for several days. The guy I spoke to quoted me £168 and clarified what we already know. Parts are constrained for this machine. However, he said there was good news. Apple will replace the battery for free IF I'm prepared to wait until November 15th. I will then need to make another appointment, they'll check that I've already reported this and they'll "reward" me for my patience and replace the battery. I'm guessing November the 15th is the date when supplies free up. SO, to recap. If your 2012 MBP battery is showing battery warnings...AND you're prepared to wait until November if you can get it replaced for free : Book an appointment to get a genius to check it NOW. They'll advise you of the supplies problem and offer you this deal if you don't mind waiting. You'll then need to book another Genius appointment in November. It's a bit of hassle, but the reward is a free replacement of the battery and a decent saving. Aside from the battery warnings, my MBP runs like a charm so I'm happy to wait. NB. I have no proof of the November thing. Apple have not summarised what was said in the appointment in an email. And the genius told me that they would not email me in November to remind me of this offer.