However, a 2011 MBP 13' is still on the Vintage list and may be eligible for an OEM battery replacement - at least in the US. It's hard to decipher what it means where several regions are mentioned as making no distinction between Vintage and Obsolete. They've modified their policy (I believe from last October) where Vintage devices are eligible for service with repair parts. However, your MacBook Pro is on Apple's 'Vintage' list. I would prefer an OEM battery since there seem to be issues with most aftermarket replacements. However, Apple's official policy is that the battery should only be serviced by Apple or an Apple Authorized Service Provider. The battery is replaceable, and a fairly simple thing to do with the correct tools. Contact an Apple Authorized Service Provider or Apple Retail Store for assistance servicing a removable battery.' Most older Mac notebooks have removable batteries that you can replace yourself. MacBook Pro (13-inch, Mid 2009) and later MacBook Pro (15-inch, Mid 2009) and later.All MacBook Pro computers with Retina display.MacBook (Retina, 12-inch, Early 2015) and later.These Mac notebooks have built-in batteries: MacBook, MacBook Air, and MacBook Pro computers with built-in batteries should only have their batteries replaced by an Apple Authorized Service Provider or Apple Retail Store. Attempting to replace a built-in battery yourself could damage your equipment, and such damage is not covered by warranty. 'Servicing the battery in your Mac notebook How do I confirm if my mac has a removable battery? But the link below seems to suggest otherwise.

I thought my early 2011 macbook pro has a removable battery.

Apple macbook pro late 2011 battery