User level: Level 1 (4 points)Iphone 14pro max
I updated to iOS 27.0.1 days ago. Before the update, I had changed to a brand new, Apple-calibrated battery. After upgrading iOS, I am facing some serious issues.
Overheating happens even during basic tasks like light Chrome browsing, using Amazon, or downloading/updating apps. It's very basic usage, but the phone gets very hot and lags, making it unusable. While charging, the phone feels like a hot pan."
Posted on Oct 7, 2026 10:39 AM
User level: Level 10 (233,174 points)Oct 7, 2026 10:50 AM in response to rohith290
Who replaced the battery, where exactly? If the battery was replaced by anyone other than Apple directly or an Apple Authorized Service Provider (like BestBuy in the US), you may think you have an "Apple Calibrated Battery" but you don't. No one other than Apple or Apple Authorized Service Providers can install an authentic Apple battery in an iPhone.
User level: Level 10 (97,882 points)Oct 7, 2026 2:17 PM in response to rohith290
Welcome and thank you for reaching out. 🤗
If a service provider uses nongenuine battery parts, the replacement battery might be:
While a nongenuine battery can be used in an iPhone repair, any of the above issues could lead to insufficient battery capacity, improper fit or performance issues. Using nongenuine batteries might also result in unexpected behavior after installation, device software updates or while charging.
Using nongenuine batteries might also lead to safety issues. ⚠️
Genuine batteries are designed to work with iOS to function properly, including to report charge levels and battery health. If a battery is unverified, the battery health information might not be accurate.
If you need more help, contact Apple Support directly.
Good Luck! 👋🏼😉
Smiliñ 😎 Brian | Community Volunteer
Originally posted at discussions.apple.com/thread/256372004