iPhone battery health: when to replace, when to live with it

iPhone's battery health screen is honest and useful. Here's how to read it.

100-90%

Battery is healthy. No action needed.

89-80%

Mild degradation. You'll lose 30-90 minutes of screen-on time. Replace if you charge twice a day.

79% and below

iOS will start throttling peak performance. Battery replacement strongly recommended (about 700 MAD via Mille refurbisher).