How to Analyze iPhone Battery Health and Performance

Step by step

1. 30 sec

   Access Battery Health settings

   Open the Settings app on your iPhone. Scroll down and tap Battery, then select Battery Health & Charging. This screen provides the primary metric for your current hardware status.

   Note: If you see a service message here, the battery is significantly degraded and requires professional replacement.
2. 1 min

   Interpret Maximum Capacity percentage

   Observe the Maximum Capacity indicator. This value represents your battery capacity relative to when it was new; a lower percentage indicates decreased usage time between charges. Capacity below 80% is the threshold where iOS considers the battery worn.

3. 1 min

   Check for Peak Performance Capability

   Look for the Peak Performance Capability section under your battery percentage. If your iPhone has experienced unexpected shutdowns, iOS will automatically apply performance management to prevent future restarts. If this is active, you will see a link to disable it.

   Note: Disable this only if you prefer system speed over device stability.
4. 1 min

   Review usage patterns

   Return to the main Battery menu to view the battery usage breakdown. Tap Show Activity to see which applications consume the most power over the last 24 hours or the last 10 days. Identify high-drain apps that may be causing excessive heat or rapid discharge.

   Note: Background activity is a common culprit for silent battery drain.
5. 30 sec

   Enable Optimized Battery Charging

   Within the Battery Health & Charging menu, toggle the switch for Optimized Battery Charging to On. This feature reduces battery wear by delaying the final charge phase until just before you need to use the device. It utilizes on-device machine learning to track your daily charging routine.

   Note: For iPhone 15 and later, consider setting the 80% Charge Limit if you rarely exhaust your battery during a single day.