1. Open the settings of iPhone and find "Battery". There is a "battery health" entrance. You can see the "Maximum Capacity" after input, and the percentage behind it is the actual capacity of the current battery.
2. Quick instruction query. Enter iPhone Settings-Privacy-Analysis, open * * to enjoy iPhone analysis, check the analysis data, and find the serial number starting with "log". If there is a time record, select the latest date, open it, click the "Share" button in the upper right corner, and choose to save it to a file; Open the shortcut command, click the "Battery Health" command, and select Start Analysis, which will open the folder that comes with the iPhone, find the file that just started with "log" and click directly; Wait 2 seconds to get the analysis result, which clearly shows the charging times, design capacity, actual capacity, battery life and analysis time.