These phones have aging lithium-ion batteries that might cause random shutdowns. So, to prevent them from shutting down, Apple slowed 8211; or 8220;throttled8221; 8211; the performance of those phones.
Users weren8217;t that impressed that Apple was fiddling with the performance of their devices without telling them 8211; even if the controls would make the actual device last longer.
Battery replacement program for iPhone 6, 6S, 7 and SE
The scheme will set you back £25/$29 8211; a huge discount on Apple8217;s usual service cost. The scheme ends on 1 December 2018 so you haven8217;t got long!
However, the battery management issue has raised its head again as Apple has revealed that the recent iOS 12.1 update brings the battery management features to iPhones that are just a year old 8211; the iPhone 8, 8 Plus and iPhone X. Presumably the management will come to iPhone XS, XS Max and XR in late 2019.
Apple8217;s official iPhone battery and performance notes say that the effect on the newer devices may not be as profound though: 8220;performance management may be less noticeable due to their more advanced hardware and software design8221;.
So let8217;s look at how Apple8217;s Battery Health tool works.
iOS 11.3 and later has a Battery Health tool built in. Just go to Settings > Battery >Battery Health. From there, you8217;ll see information about your iPhone8217;s maximum capacity and peak performance capability
Our 2018 iPhone X is showing as having a 93 percent battery capacity a year after it was first new. Apple is not yet throttling the phone though: 8220;Your battery is currently supporting normal peak performance8221;.
You8217;ll even see whether your iPhone needs service and can subsequently turn off the controversial throttling (8220;performance management8221😉 feature that8217;s throttling your iPhone. And finally, there is one other battery-related change in iOS 11.3, according to Apple:
8220;iOS 11.3 improves this performance management feature by periodically assessing the level of performance management necessary to avoid unexpected shutdowns. If the battery health is able to support the observed peak power requirements, the amount of performance management will be lowered. If an unexpected shutdown occurs again, then performance management will increase. This assessment is ongoing, allowing more adaptive performance management.8221;
How to disable throttling on an iPhone
Under Battery in the Settings app you8217;ll notice the Battery Health option. Tap it. You8217;ll then see a screen with a link to more information about lithium ion batteries. Below that, you8217;ll see your battery’s maximum capacity.
If this indicator is under 80 per cent, you8217;ll see another message at the bottom of the screen that warns your iPhone8217;s battery is “significantly degraded”. There will be another link that will point you to a page about how to get your phone serviced.
If your device has shutdown due to battery degradation, this same screen will tell you that “performance management has been applied to prevent this from happening again”. There will also be an option to disable the throttling. You can’t enable throttling (the 8220;performance management8221; feature) until you experience another shutdown. Your iPhone will auto-enable it should that ever happen.
In the Battery Health menu, you8217;ll see a percentage that indicates your iPhone battery8217;s maximum capacity, followed by a message explaining your iPhone battery8217;s peak performance capability. The message you get depends on the percentage shown.
- 100 percent: Your battery is currently supporting normal peak performance.
- 95 percent: This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. Performance management has been applied to help prevent this from happening again. Disable8230;
- 79 percent or less: Your battery8217;s health is significantly degraded. An Apple Authorized Service Provider can replace the battery to restore full performance and capacity. More about service options…
- Unknown: This iPhone is unable to determine battery health. An Apple Authorized Service Provider can service the battery. More about service options…
Apple explained that maximum battery capacity measures your iPhone8217;s battery capacity relative to when it was new. Batteries will start at 100 per cent when first activated and will have a lower capacity as the battery ages. According to Apple, a normal battery is designed to retain up to 80 per cent of its original capacity at 500 complete charge cycles when operating under normal conditions.
Now, as far as peak performance capability goes, it is the ability of your iPhone8217;s battery to supply adequate charge. If your iPhone8217;s battery maximum capacity is under 80 per cent, then its health has been significantly degraded and it needs replacing.