iPhone XS Max turning off at 6%

NOTE: Try and not let the battery charge drop below 20% if you can. It is not good for the iPhone’s battery.

In your case, the issue appears to be the battery in your iPhone XS Max. You may have a poor battery condition which cannot provide sufficient power for peak performance. What is the Battery Health of your iPhone? Open Settings ➡️ Battery ➡️ Battery Health and let us know which percentage you see for Maximum Capacity. Also note what is written under Peak Performance. If your battery's Maximum Capacity shows a value of 80% or less, then it has gone through its lifecycle and therefore should be replaced, according to Apple.

Axel F.

The second by second, minute by minute update you see on your device representing the amount of charge remaining is only an estimate. Sensitive electronic devices, iPhones, camera, etc. can be damaged if too low a voltage is sent through the sensitive electronics such as the processor and other sensitive integrated circuits. When your iPhone detects the voltage is dropping too low, it turns off the iPhone, thus protecting the sensitive electronics.

Why isn’t the estimate more accurate? You can change things to both increase battery life and decrease battery life, such as turning down the screen brightness, turning off WiFi, etc. But ultimately, it’s designed to protect your iPhone.

A Maximum Capacity of 100% for your battery would indicate that you have had the battery replaced recently....maybe in the last month or two.

Is that the case?

If not, and you have not replaced the battery in a long time, or never, then the battery calibration on your phone is not correct.....and that issue will need attention.