Apple has revealed a component failure in a limited number of MacBook Pros has caused built-in battery to expand, and has said it will offer worldwide free replacement for such batteries. According to the company, it is not a safety issue, and Apple Inc. Apple walks you through the replacement process here.
It is believed that the "limited number" of 13-inch MacBook Pro manufactured between October 2016 and October 2017 were affected.
Users who believe their 13-inch MacBook Pro suffers from the described swelling issue can check eligibility by plugging in their device serial number on Apple's dedicated replacement webpage. The affected 13-inch MacBook Pro (non Touch Bar)'s were produced between October 2016 and October 2017. To check if your MacBook Pro is eligible for this, you will need to enter in your MacBook Pro's serial number on Apple's support page and hit submit. You will have to find your nearest Apple Authorised Service Provider or make an appointment at the nearest Apple Retail Store or send the laptop to the nearest Apple Repair Centre.
Apple noted, that the "your 13-inch MacBook Pro will be examined prior to any service to verify that it is eligible for this program and in working order". In case your Macbook is eligible, you will get the battery replacement from Apple free of cost. Apple further notes that the replacement program will not extend the standard warranty coverage of the affected MacBook Pro.
Hat tip to Actualités Apple for spotting the new battery replacement program, which is also available in Canada.