It seems to die with battery as high as 60%, though it only happens in cold weather conditions, and then immediately switch back on if plugged into a power source.
It's definitely cold-dependent in my case, and only started to show same problems again in November of 2016.
Apple support says the remote battery test shows no problem. The Genius Bar guy ran a test with the phone physically present and confirmed the battery is showing some signs of age, but still within spac.
We live in Hong Kong. One of the phone support guys we've talked to in the past couple weeks checked for a recall for my wife's phone's specific serial number and said "There's no recall in Hong Kong for that serial number". When I pressed him about if the same serial number had a recall in other countries, he said something about New Zealand. However, he changed subjects quickly enough and didn't come back, so I couldn't really catch if there really was a recall in New Zealand for this serial number, or he was just mentioning a hypothetical possibility.
In any case, Apple isn't replacing our battery, and my wife doesn't have a pre-upgrade phone backup, so we are unable to test if the shortened battery life is just coincidental with the iOS update.
I took her to the phone market yesterday and we picked out an Android phone for her. Now I'm going through the pain of exporting and migrating what data we can, and manually migrating some other data.
As a long-term Apple user and shareholder, the botched MBP and iPhone 7 this year, along with the iPhone 6 battery issues and the lack of empathy shown toward my wife all make me more than a bit sad. I would have considered upgrading my wife's phone to an iPhone 7, except her frustrations with Apple support have made that a no-go.
make an appointment. they're replacing a lot of batteries these days. also, check with your credit card (if you bought it with one) as many cards extend the warranty by an additional 12 months. That might come in handy.
