iPhone 6S will not charge to 100% My iPhone 6S will not charge to 100%. I have iOS version 10.0.2 right now but I'm pretty sure it has been like this for older versions. It also usually powers off before it reaches 0% (sometimes as high as 30%) so maybe that has something to do with it.

I just downloaded http://www.coconut-flavour.com/coconutbattery to see if that might give any insight.

Is there anything else I can try?
A batch of Apple's iPhone 6s models had a problem where battery reaches about 30% and switches off. This was due to a battery defect and they have opened a scheme for those affected consumers to get the battery replaced. It's not a software problem, it's a manufacturing defect.

For more info: iPhone 6s Program for Unexpected Shutdown Issues.