I work for bestbuy in geeksquad at an apple authorized service provider. We probably replace about 15 iphone batteries a day. Since the 11.3 release after we replace batteries with 100% genuine apple batteries we still get the “service” response on the health status about 1 in 4 times. We believe its a bug- considering its a beta. We have been working with apple and have been trying to discover a solution. We had tried replacing batteries a second time and have same outcome. In rare occasions doing a full restore has worked, but nothing we have found consistenly solved the issue.