My phone refused to charge past 80% until I changed this one buried setting
Learn why your iPhone keeps stopping at an 80% charge and how to turn off the hidden iOS setting holding back your battery life.
Yesterday morning, I found my iPhone unexpectedly displaying an 80% charge level. Initially, I suspected a faulty charging cable or a deteriorating battery. However, after trying a new cable and still facing the same problem, I discovered the issue lay in a battery setting intentionally implemented by iOS to safeguard long-term battery health.
While this is beneficial for battery longevity, it can be inconvenient when you urgently need a fully charged device. Thankfully, resolving this issue is straightforward. To regain full battery capacity on your iPhone, follow these steps:
1. Open the Settings application on your iPhone.
2. Scroll down to the Battery section.
3. If you own an iPhone 15 or later model, locate the Charge Limit slider and set it to 100%. For older iPhone models, find Charging Optimization and change it to None or disable Optimized Battery Charging.
After adjusting this setting, my iPhone accurately reached a full 100% charge every night. However, if you're concerned about potential battery degradation, you can revert the charge limit to a lower percentage before going to sleep. As noted in other articles from Tom's Guide, you can further enhance your iPhone experience by exploring new features like creating calendar events in iOS 27 and customizing your lock screen.
Written by urgent.news from Tom's Guide's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
