My battery is working fine before this and all in sudden my iphone was not able to verify my battery and my phone keep switching on and off
Iphone unable to verify my battery
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Important Battery Message
If you see this message, the battery in your iPhone cannot be verified, and reported battery health information isn't available. This might be due to the installation of a battery that is not a new, genuine battery. This message applies to iPhone XS, iPhone XS Max, iPhone XR, and later.