Apple is offering iPhone 6S owners who have discovered their devices keep randomly crashing to have a new battery fitted, free of charge, in an effort to stop the issue returning.
Apple's official information is that a limited number of phones have the problem, but it is presumably enough to require such a programme.
"Apple has determined that a very small number of iPhone 6S devices may unexpectedly shut down. This is not a safety issue and only affects devices within a limited serial number range that were manufactured between September and October 2015," said the firm on the Apple battery swap shop page.
"If you have experienced this issue, please visit an Apple retail store or an Apple Authorised Service Provider and have your device's serial number checked to confirm eligibility for a battery replacement, free of charge."
Phones will go through some kind of inspection to ensure that they do have a battery problem.
"Choose one of the service options below to have your battery replaced. Your iPhone will be examined prior to any service to verify that it is eligible for this programme and in working order. Please call your service provider to confirm that the battery replacement service is available on the day you visit them," said Apple.
Apple warns users to make sure their device is fixed in all other ways before entering into the battery exchange programme, as otherwise this may need fixing first and at a cost to the owner.
"If your iPhone 6s has any damage such as a cracked screen which impairs the replacement of the battery, that issue will need to be resolved prior to the battery replacement. In some cases, there may be a cost associated with the repair."
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