How to test the iphone6splus battery?

1. Open Settings-Privacy 2. Turn to the bottom and select Diagnostics and Dose 3. Confirm that the automatic transmission is selected. If it is not selected, check it again at this time tomorrow. If automatic transmission takes more than one day, click Diagnostic and Dose Data. There may be a lot of data in it, but it is sorted alphabetically. Turn to the beginning of L, find the log starting with log-aggregated, followed by the date, and select the log file with the latest date (these log files will be generated every day, but only when the automatic sending option is turned on, so if you don't open it, you will have to wait for one day). 5. Click on the log file, turn to the bottom, stop when you see a bunch of TCP words, and slowly turn it up to find it.