battery level drops rapidly to 1%, then stays there for hours of use
Hello:
Two days ago the battery indicator on my iPhone 7 (iOS 13.1.3) started acting erratically. After I charge it to 100%, it drops quickly (in about an hour) to 1%, yet the phone keeps working for hours thereafter without shutdown of charging (and the indicator keeps showing 1%). How can I restore correct functioning to the battery level indicator?
Thank you!
iPhone 7, iOS 13