Apple Inc. has issued a voluntary recall and replacement program for 15-inch MacBook Pro computers sold between September 2015 and February 2017 because a battery issue raises the risk of their catching fire.

The recall specifically covers the MacBook Pro (Retina, 15-inch, mid-2015) model. Apple said that in a limited number of units, the battery may overheat and pose a fire safety risk. Apple noted that the recall does not affect any other 15-inch MacBook Pro units or other Mac notebooks.

“Because customer safety is a top priority,” the company wrote in an advisory today, “Apple is asking customers to stop using affected 15-inch MacBook Pro units.”

The battery replacements are being offered free of charge to affected users and the replacement doesn’t affect other terms of warranty coverage. Batteries can be replaced at Apple Stores or authorized service providers or via mail. Battery replacement has a time frame of one to two weeks since each device has to be sent to an Apple Repair Center to have the battery replaced.

Apple hasn’t disclosed exactly how many of the MacBook Pros may have a battery fault, but the fact that they are prone to catching fire isn’t new.

A video posted to Twitter by a user called White Panda in May shows footage of a MacBook Pro, believed to be the mid-2015 model, exploding during normal use. A report in February highlighted a different case of a MacBook Pro being destroyed by an exploding battery, this report specifically naming the mid-2015 model.

CNBC reported that battery issues are not uncommon in consumer electronics, citing the now infamous recall of Samsung Electronics Co. Ltd.’s Galaxy Note 7 because of an exploding battery issue. But in reality, battery issues are fairly rare.

Lithium-ion batteries, the standard type of batteries used in consumer electronics devices, have a failure rate of less than one in a million. Apple’s recall would suggest, as was the case with Samsung previously, that a manufacturing issue was involved, raising questions once more about Apple’s quality control.

Image: Apple