Apple has ruled out a free replacement scheme for iPhone 6 smartphones suffering from bad battery life.
Last year, the company admitted there was a problem with some iPhone 6S and iPhone 6S Plus units, which caused the devices to switch off when the battery level reached 40 per cent, or lower.
Apple has rolled-out a serial number checking tool that allows iPhone owners to check whether their device is affected by the problem.
It also posted a statement on its Chinese website, providing additional information on the problem.
"Outside the affected batch, a small number of customers reported an unexpected shutdown.
"Some of these shutdowns may be normal because the iPhone will shut down to protect its electronic components. To gather more information, we will add an additional diagnostic feature to the iOS software update that is released next week."
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