SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/overnight-charging-ok

Does charging a modern phone overnight automatically ruin its battery?

No. Many phones use controls to reduce charging wear.

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The Just Right card

Too littleLet it die before charging
Too muchUnplug it the second it hits 100
Just rightCharge overnight, smart charging on

Huh, didn't know that: All rechargeable batteries become less effective as they chemically age.

The dad joke
Why did the boy run around his bed? To catch up on his sleep.
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References

Answer: No, modern phones use charging controls. Modern phones can stop or pause charging to reduce battery wear. Some learn your routine, pause at 80 percent, then finish before you usually unplug.

  1. Apple Support: Charge and maintain your iPhone battery support.apple.com/en-nz/105105
    iPhone automatically stops charging when the battery is fully charged, so it's safe to keep your iPhone connected to a charger overnight.
    Checked 2026-10-09.
  2. Samsung Support: Will charging your Galaxy phone overnight damage the battery? www.samsung.com/ca/support/mobile-devices/will-charging-your-galaxy-phone-overnight-damage-the-battery
    Your phone’s battery will not be at risk of overcharging if you leave it plugged in overnight.
    Checked 2026-10-09.
  3. Apple Support: About Charge Limit and Optimized Battery Charging on iPhone support.apple.com/en-us/108055
    When the feature is enabled, your iPhone will delay charging past 80 percent in certain situations.
    Checked 2026-10-09.

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That's stuff everyone should know.