Apple on Friday said component failure in a limited number of MacBook Pros has caused built-in battery to expand, adding, it will offer worldwide free replacement for such batteries.

Apple said the flaw, reported in some 13-inch Macbook Pros without Touch Bars, is not a safety issue.

The affected units were manufactured between October 2016 and October 2017, Apple said on its support page, without giving the actual number of MacBooks affected. Users can enter their MacBook's serial number on the support page to check whether their unit needs to be replaced. If their laptop is indeed affected, they need to take the unit to an Apple Repair Centre, an Apple Retail Store, and an Apple Authorised Service Provider for repairs. Customers who have already paid for the battery replacement will be eligible for a refund, the company has said.

The iPhone maker previously came under scrutiny after it confirmed in December that software to deal with aging batteries in iPhone 6, iPhone 6s and iPhone SE models could slow down performance. The company later apologised and lowered the price of battery replacements for affected models to $29 from $79.

© Thomson Reuters 2018