The steps depend on whether you have an Android phone or an iPhone.

iPhone

  1. Open Settings.

  2. Tap Battery.

  3. Tap Battery Health & Charging.

  4. Check:

    • Maximum Capacity – shows the battery's current capacity compared to when it was new.

    • Peak Performance Capability – indicates whether the battery can support normal performance.

A Maximum Capacity of 80% or higher is generally considered normal. If it drops below 80%, Apple recommends considering a battery replacement.

Android

Most Android phones do not display battery health in Settings, but some manufacturers do.

  • Samsung Galaxy

    • Open the Samsung Members app.

    • Go to Support → Phone diagnostics → Battery status.

    • Some models also show battery information in Device Care.

  • Google Pixel

    • Newer Pixel models may include battery health information in Settings → Battery (availability depends on Android version).

    • If it's not available, you can use the phone's diagnostic tools or a reputable battery monitoring app.

  • Xiaomi, OnePlus, OPPO, vivo, realme, Motorola, etc.

    • Most do not provide a built-in battery health percentage.

    • You can use a trusted battery monitoring app to estimate battery health by measuring charging behavior and capacity over time. These estimates are not as accurate as manufacturer-provided values.

If you tell me your phone brand and model (for example, Samsung Galaxy S24, Redmi Note 13, OnePlus 12, or iPhone 15), I can provide the exact method for your device.