During charging, the attached message popped up on 2 different occasions. The phone wasn’t close to liquid or anything damp. My battery’s health is at 88%. Why is that message coming up? Is there a problem with the system or the battery?
iPhone 11, iOS 14
You should arrange a repair
https://support.apple.com/iphone/repair/service
Anything other than Screen or Battery may be a replacement phone and the price is in the article, depending on your warranty or AppleCare+ status.
You can see additional service information within the following article:
Get your iPhone, iPad, or iPod touch ready for service - Apple Support
Charging pop up message
