Apple recently acknowledged that there are battery problems on some iPhone 6S models that caused the devices to shut down unexpectedly. Now, following the announcement of Apple about its global battery replacement program, Power Mac Center (the authorized Apple Service Provider in the Philippines) through their Facebook and Twitter pages, has announced that the said service is now available here through their centers.
The Apple iPhone 6s Battery Replacement Program is now available in our Service Centers. A very small number of iPhone 6s devices have been determined by Apple to 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. If you have experienced the same issue, you may email our Customer Service Team through firstname.lastname@example.org or call (02)725-4PMC (4762) for further assistance. – Power Mac Center (Facebook)
Check if your iPhone 6s is eligible here: LINK
via Apple, Power Mac Center, YugaTech