iPhone turns itself off at 30%

Originator:piet
Number:rdar://28806363 Date Originated:17-Oct-2016 10:10 PM
Status:Open Resolved:
Product:iOS Product Version:14b71
Classification:Other Bug Reproducible:Sometimes
 
Summary:
Sometimes the iPhone powers itself off at 30%, when connected to power again it boots and it proudly displays it has 31% of battery remaining. (It happens at various percentages, just using 30 as an example)

Steps to Reproduce:
Use your iPhone until the power is below 50%

Expected Results:
You can reach 0% before it turns itself off.

Actual Results:
At 30% it turns itself off (I've also had it happen at any number between 20 and 40), I've seen it happen much less when I am in Low Power mode (but I rarely get there)

Regression:
This didn't use to happen.

Notes:
t's a sunny day, you're taking a nice walk with your glorious computing device of the future and suddenly you see a scene so beautiful it could make Chuck Norris weep. Quickly you take out your glorious computing device of the future, it still has 30% battery left!, and open the Camera app, you frame the perfect shot and… the glorious computing device of the future goes black. You connect it back to your external battery only to be greeted by 31%, like it's mocking you. O how it mocks me.

This usually happens when I haven't touched the iPhone in a while, so it went from 60 to 30% with a black screen, if I then unlock it and open one of these (also happens with other apps, but these are usually the ones I'm opening in such a situation):

- Camera.app
- Waze.app
- Maps.app
- Twitterriffic.app

My glorious computing device of the future just shuts down.

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