How to delete the message for the important battery

Hi there wan257,

Welcome to the Apple Support Communities. We see you have a concern about your battery. Having a working battery is definitely important, and we have a resource that may help.

It sounds like you're seeing the message shown below, from the link titled About genuine iPhone batteries:

"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.

Unable to verify this iPhone has a genuine Apple battery. Health information not available for this battery. Learn more…

You might see an additional notification that says, "Apple has updated the device information for this iPhone." This means that Apple has updated the device information maintained for this iPhone for service needs, safety analysis, and to improve future products.

These notifications donʼt affect your ability to use your iPhone or your battery.

You will see a notification on your lock screen for the first 4 days that you use your device, and in the Settings app for 15 days. After that period, you can find the notification by going to Settings > Battery > Battery Health."

Based on the above, the notification should disappear from your lock screen after 4 days. You may want to consider the below based on the message you're seeing:

"Where to get service

You can get your iPhone battery replaced at an Apple Store, an Apple Authorized Service Provider, or by sending it to an Apple Repair Center. For out-of-warranty battery replacements, Independent Repair Providers will also offer genuine parts by trained technicians. All of these service providers offer genuine Apple battery parts.

Get started with battery service."

Kindest regards.