Apple’s iPhone 6s battery replacement programme, targeted at a select number of models made between September and October 2015, has been extended so that users can now check online whether they’re eligible.
Until now, those affected by the issue were told to go to their nearest Apple Store or official reseller to see if they qualified.
Now, iPhone 6s owners can go directly to Apple’s website and enter their device’s serial number to see if they have one of the problem handsets.
The serial number can be found by tapping on 'Settings', then 'General', then 'About'. The long serial number will appear at the top of the screen.
Apple is replacing batteries free of charge. Customers who had already paid to have their battery changed are entitled to a refund.
However, if devices have cracked screens, this will need to be fixed first at an extra cost.
Users had complained that a number of iPhone 6s models were switching themselves off without warning and were unable to boot up again.
It comes just weeks after Apple began replacing processors related to malfunctioning touchscreens on the iPhone 6 Plus.