Apple Philippines in partnership with Power Mac Center, a premier Apple partner in the Philippines, announced on both their Facebook and Twitter account that the Battery Replacement Program For iPhone 6s is now available in any of their service centers.
— Power Mac Center (@PowerMacCenter) January 18, 2017
Apple initially announced that iPhone 6s sold between September and October 2015, and experiencing unexpectedly shut down then they will replace your iPhone 6s’ battery for free.
To check if your iPhone 6s is eligible for the battery replacement program, just go to the Apple Support Page and then just type the serial number of your iPhone 6s in the text box then click submit. A message will tell you if you’re eligible for the battery replacement program or not.