The TestM diagnostic mode offers 26 tests, which range from testing the cameras, touchscreen, microphone, and even the haptic engine, to a comprehensive stress test that pushes ...
How to find if apps are draining your battery, or you need a new battery fitted in your iPhone.
Your first port of call should be the Battery Health page (System > Battery > Battery Health). Here Maximum Capacity should be above 80 percent, and you should have Optimized Battery Charging enabled. If Maximum Capacity is less than 80 percent, or you have a message under Peak Performance Capability about unexpected shutdowns, then there's a problem with the battery and you need it looked at.
Caption by: Adrian Kingsley-Hughes
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