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Understanding Optimized Battery Charging on iPhone

Tap through the steps to see how the feature works.

  1. Understand how the feature works

    This feature learns your usual charging pattern, charges quickly up to 80%, and then finishes the remaining charge closer to when you actually need it, reducing the time your battery spends sitting at 100% and slowing its long-term aging.

  2. Open Battery Health & Charging in Settings

    In the Settings app, tap 'Battery,' then go to 'Battery Health & Charging.'

  3. Turn the feature on or off

    Tap the toggle next to 'Optimized Battery Charging' to turn the feature on or off -- it's enabled by default.

  4. Know what to expect during the learning period

    For the first several days after turning the feature on, your iPhone is still learning your usage pattern, so charging speed may feel different from usual.

  5. When it makes sense to turn it off

    If you're traveling and need your phone reliably charged to 100% at all times, temporarily turning this feature off can be the better choice.

A useful feature if you want your battery to last longer

Lithium-ion batteries age faster the longer they sit fully charged at 100%, so this feature is designed to reduce that time by finishing the last stretch of charging closer to when you'll actually unplug and use the phone, slowing long-term battery degradation.

Battery health habits worth keeping in mind more broadly

Beyond this one setting, avoiding extreme heat while charging, not routinely running the battery down to 0%, and periodically checking your battery health percentage in the same Battery Health & Charging screen are all simple habits that help preserve capacity over the life of the device.

Frequently Asked Questions

Does turning this feature off damage the battery or create a safety risk?

No, turning it off carries no safety risk at all. The main downside is that your battery will spend more time sitting at 100%, which can be somewhat less favorable for its long-term lifespan.

Does unplugging and reconnecting the charger reset what it has learned?

No, a brief disconnection doesn't reset anything -- the iPhone builds its charging pattern from your overall behavior accumulated over days or weeks, not from any single session.