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Apple finds iPhone 5S battery fault

Apple has found a battery defect in one of its latest smartphones that causes battery life to be significantly diminished in some user’s models.

The defect affects a limited number of the iPhone 5S and causes battery life to drain more quickly than on a phone that isn’t affected.

“We recently discovered a manufacturing issue affecting a very limited number of iPhone 5S devices that could cause the battery to take longer to charge or result in reduced battery life. We are reaching out to customers with affected phones and will provide them with a replacement phone,” Teresa Brewer, an Apple spokeswoman, told the New York Times.

Apple declined to say how many iPhone 5S devices the issue affects but the NYT speculates that as nine million new iPhones were sold in the opening weekend, a few thousand phones will have the defective battery.

Apple released the iPhone 5S in the middle of September at twin launch events in both California and Beijing. The headline feature of the new device is its A7 processor that brings a 64-bit processor to a smartphone for the first time, which is supplemented by an M7 coprocessor to handle some of the workload.

The M7 chip, in particular, is supposed to improve battery life by performing less intensive tasks without the need to engage the main CPU and it measures motion data from a variety of different sensors.

The iPhone 5S is the first Apple smartphone to feature a home button fingerprint scanner to improve security and it allows users to unlock the device as well as to authorise iTunes purchases.

It also benefits from a small upgrade to its camera with the same 8-megapixel camera gaining a larger image sensor as well as a two-tone flash, slow-motion video capture and burst capture.