Have you had a new battery installed by an unauthorised repairer? If so, your iPhone is detecting that. Here is a link that should help you find an authorised repairer:
iPhone Repair and Service – Apple Support (UK)
Apple Intelligence is now available on iPhone, iPad, and Mac!
You can make a difference in the Apple Support Community!
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
Have you had a new battery installed by an unauthorised repairer? If so, your iPhone is detecting that. Here is a link that should help you find an authorised repairer:
iPhone Repair and Service – Apple Support (UK)
Either you had your battery replaced with a non-Apple battery or there's something wrong with it. The only way to resolve this is by having Apple replace the battery with a genuine one:
battery healt
battery healt