SE first generation battery
I have a 2017 SE. Battery drains in an hour or 2 from. 100% to less than 10% while sitting unused! I’m not even using the phone. What’s wrong?
Battery health is at 98%
iPhone SE, iOS 15
Question marked as
Your phone is 6 years old, the battery is shot. It's giving you a bad health reading, time for a new battery.
Batteries degrade over time with usage due to chemical aging, that's just how they work.
You can expect about a 1% drop per month with average use on an iPhone.
Apple recommends replacing it when it reaches 80%.
iPhone Battery Replacement.
iPhone Battery Repair & Replacement - Apple Support
About Lithium Ion Batteries
iPhone battery and performance - Apple Support (IN)