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iOS 13 Introduces New 'Optimized Battery Charging' Feature
Found in the Battery section of Settings under "Battery Health," the optional toggle learns from your personal habits and waits to finish charging all the way up until you need your iPhone.

For example, if you often charge your phone up at night while you sleep, Apple might charge it to 80 percent right away, but wait until an hour or so before you wake up to charge the remaining 20 percent.
That keeps your iPhone at an optimal capacity for battery health, rather than keeping it close to 100 percent on the charger.
Avoiding topping up the battery continually while it sits on the charger reduces the amount of time that your device spends at maximum capacity, and over time, this could extend the life of your battery.
Battery health has been a hot topic over the course of the last year, after Apple was found throttling the processor speeds of iOS devices with degraded batteries to prolong device life as long as possible.
That issue spurred Apple to be more forthcoming about overall battery health, providing details about capacity and performance in the Battery portion of Settings. Aside from the new toggle to optimize charging, there are no major changes to the Battery Health feature in the first iOS 13 beta.
Top Rated Comments
(View all)I mean it could just adjust it to my alarm, but since you can have multiple alarms set, it could get a bit messy.
Apple was found throttling the processor speeds of iOS devices with degraded batteries to prolong device life as long as possible.
Sounds great, but what happens if there's the odd day when you have to get up at 3am for a long day of work? Having that 20% missing will be particularly important if I get up earlier than usual.
I mean it could just adjust it to my alarm, but since you can have multiple alarms set, it could get a bit messy.
Yes, it would be nice if it tied to the alarm though. Maybe it will.
Kudos to Apple for continuing to find ways to make life better... for our batteries.
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I wonder how this will work with the smartbattery cases? Will it only apply 80% to the internal battery or both the internal battery and case? Guess I’ll test it when it comes out.
Does the device have the ability to control the external case batteries? Through an app? API? I have no experience with these.
I can't see how iOS can control the charging of an external case unless they talk to each other.
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