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iPhone shutdown battery at 20%

Fix iPhone Turn Off When Still Have Battery Life Remaining?

If you own an iPhone, perhaps you’ve experienced the mystifying wonkiness of your battery icon. Your battery goes below 20% and total anarchy ensues: the power level jumps around, and your phone shuts off long before you’ve reached 0%. You’ve probably also noticed that sometimes it takes a weirdly long time to dip below 100% after a full charge. iPhone shutdown!!

The iPhone 6S and 6S Plus have a strange quirk, in which the level on the battery power indicator freezes after people change time zones or manually change the time. So your iPhone battery icon on the top right of your screen might show 50%, even when it’s about to die.

Your iPhone lies about how full the battery really is

Lithium ion batteries are all kinds of quirky, and it’s actually bad for them to be at 100% or fully depleted to 0% because it messes with their longevity. So iPhones, and other smartphones that use Li-ion batteries, purposely throttle how much power they demand from the battery.

When it’s plugged in, your iPhone will cease charging before the battery actually reaches a full 100%. It will also preemptively shut down before it’s completely out of juice. The latter not only protects the battery, but also ensures there’s enough power in there to complete a safe shutdown, and to issue the dreaded “needs charging” screen when you try to reboot.

All that’s well and good. The thing is, this sort of compensating at either end of the battery cycle confuses your phone over time, and that’s the reason why it will sometimes shut down when you don’t expect it, way before your indicator reaches zero.

Method 1: Back up & Restore as New

The next step is to restore the device as new, then restoring from a backup, but only do this after you’ve made a backup of everything on the iPhone.

  1. Connect the iPhone to a computer and launch iTunes
  2. From iTunes, choose to “Back Up Now” – this will make a most recent backup of the iPhone and everything on it (you can also backup to iCloud if you want) – wait for this to finish
  3. When the backup is complete, choose to “Restore iPhone” from the iTunes options
  4. Let the restore process complete, when finished the iPhone will start as if it was brand new. In this setup process, choose to restore from your backup that you just made

Method 2: Drain the iPhone to 0%, Charge to 100%

For many users, simply draining the iPhone battery all the way down to 0% (not just to the point of shutting down, but actually letting it completely drain) and then charging it back to 100% is enough to get the random shut-off problem to resolve itself. This usually only works if the issue is related to the iPhone battery indicator not properly showing the charge remaining.

 

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