The appearance of this message after an update, knowing that the battery is very excellent

Hey there Mahmoud-abas,

As service is recommended based upon the message, it'll be your choice whether or not to replace the battery. Just in case you want to set it up, you can use the 'Get service' option from this link: iPhone Repair & Service If you needed help setting up service, you can reach Apple Support to help you with this here: Get Support

Cheers!

That is not an error. The iPhone’s built in diagnostics have determined that your battery is failing. That is an accurate assessment. It is up to you if you want to do something about it or not. But your battery is NOT excellent.