Apple has previously issued lower service charge for affected iPhone 6 Plus users over multi-touch issues. Now, the tech company is offering free battery replacements for some iPhone 6S devices. It had been reported that a Chinese consumer protection group has begun investigating complaints of iPhone 6 and iPhone 6S unexpectedly shutting down. Apparently, the problem occurs even if the said phone has over 50 percent battery life.

Apple posted on its website that there is a very small number of iPhone 6S devices with this issue. The tech giant insists that these affected devices were manufactured back in September and October 2015. Apple added that it's only within a limited serial range. Though Apple does confirm that there is a problem, it did not specify exactly what causes it. This is what the China Consumers Association (CCA) has requested from Apple other than elaborating its actions regarding the problem, according to the Computer World.

Consumers are advised by Apple to visit an Apple Retail Store or any Apple Authorized Service Provider. The phone's serial number has to be checked to ensure that it does have to be replaced. Likewise, the phone itself will be examined to confirm that it is eligible for Apple's replacement program. The said service is actually free of charge.

Apple also reminded those who have already bought a battery to replace their affected phone. The company should be contacted for a refund. Users are also reminded that this program does not extend the initial warranty coverage of iPhone 6S devices.

It should be noted that those who have complained said they had tried to turn their phones but were not successful. According to The Wall Street Journal, the CCA also added that even upgrading the system to the latest iOS would not prevent some iPhone 6S devices from randomly shutting down.

This is the second time that Apple has offered a repair program within a week. Apple also announced that iPhone 6 Plus users with multi-touch of flickering display issues will receive a discounted $149 service charge. That's compared to the usual price of $329. The tech company claimed that the said issue is caused by dropping the phones multiple times on a hard surface. Apple is also offering reimbursements to those who have paid for the original price. Though some have claimed that it's an engineering defect.

Unlike the unexpected shutdown of iPhone 6S, the multi-touch issue with iPhone 6 Plus goes way back in October. The Business Insider had reported about people who were frustrated that Apple would actually charge them.