"Your battery's health is significantly degraded." message on iPhone 7
𝐁𝐞𝐭𝐭𝐢𝐫𝐲 𝐩𝐫𝐨𝐛𝐥𝐚𝐦
[Re-Titled by Moderator]
iPhone 7, iOS 15
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You should visit an Authorized Apple Service Provider or Apple Store next to you place and let them check your battery, it might have to be replaced.
Use this link to find one next to your location: