We told you earlier that Apple was launching a repair program for iPhone 6s batteries, which will allow you to replace your battery for free “of course if it was defective”
mmm so how would you know it? well Apple made one more step to let you know it while you are at your home.
All you have to do is just go to iPhone 6s repair program page, where you will find tool to verify if your serial is eligible for free battery replacement.
Only small number of phones which were made between September till October 2015 had such faulty battery, just don’t forget your device has to be in a “good” working condition to get your battery replaced otherwise just forget it.