Apple has just launched a repair program for the Mid-2015 15-inch MacBook Pro, and it sounds really serious:
Apple today announced a voluntary recall of a limited number of older generation 15-inch MacBook Pro units which contain a battery that may overheat and pose a safety risk. The units were sold primarily between September 2015 and February 2017 and can be identified by their product serial number.
The recall does not affect any other 15-inch MacBook Pro units or other Mac notebooks.
Because customer safety is a top priority, Apple is asking customers to stop using affected 15-inch MacBook Pro units. Customers should visit apple.com/support/15-inch-macbook-pro-battery-recall for details on product eligibility and how to have a battery replaced, free of charge.
Apple has determined that, in a limited number of older generation 15-inch MacBook Pro units, the battery may overheat and pose a fire safety risk. Affected units were sold primarily between September 2015 and February 2017 and product eligibility is determined by the product serial number.
Please open that page and run your serial number if you are using one of these laptops.