iPhone 5s, 64GB Unlocked, Cricket. Battery was fine before upgrading to IOS 10.1.
Thank you for bringing up the battery problem and articulating it so well. At first I thought my iPhone hardware was failing, especially since I couldn't do a hard reset after it shut itself off. I hadn't dropped my phone and it has always been in a case. I never suspected an IOS bug. Went from 30% to shutting off completely - no reboot available. Then plugged it in and it rebooted to 30%.
All happened after upgrading to IOS 10.1. Latest update to IOS 10.2 did nothing to solve the problem. Before IOS 10.1, battery life was decent and when I had low power, it went into low power mode. At least I had some warning.
Was going to buy a new iPhone since I thought my hardware was defective. My battery has never had an issue with holding a charge. After finding this discussion, I don't want to be forced into an upgrade due to a software/firmware issue caused by a software release/fatal bug. From what I read here, new hardware doesn't fix the issue.
I miss IOS 9 on the iPhone 5s. Notifications were easier to read/handle on the smaller screen and the phone didn't die suddenly at 30% battery power. IOS 10 looks great on my friend's bigger and newer iPhones.
I've used and loved the iPhone since it first came out. When a bug like this turns my phone into an unusable brick when I am out and about, it doesn't instill security or confidence in Apple. Why hasn't Apple contacted users letting them know about the bug and any workarounds until they fix the problem?
Any concrete news from Apple acknowledging this is an issue and what the fix is? I'd love to see a goodwill gesture giving us an upgrade special for our time, troubles and frustration caused by this bug.