I just replaced the battery in a 2011 15 inch MacBook pro last week. It took maybe 5 minutes and cost around $100. Now the life is over 100% because the new battery I got was actually a higher capacity than the stock battery.
I find it actually almost criminal that Apple has progressively tried to make it harder and harder to do DIY maintenance and improvements. At this point I refuse to buy a new Mac. I have 15 apple products in my house….but they are not going to get any newer. I prefer to buy a good used mac and put new RAM or an SSD drive in it. Maybe the graphics is not quite up to par but they are good solid machines. People (maybe a smaller subset) want choice and options and preventing any DIY work is a bad move in my mind! Typing on a 2012 MacBook pro 13 inch…which is a great size. I was able to add a 1 TB SSD to it, but it has 8 GB or RAM and that is not enough….Chrome freezes constantly and you can only have a few apps open. Come on Apple! listen to your customers, not your shareholders.