iPhone sudden shutdown!

oyhamzatu Said:

"iPhone sudden shutdown!: I am facing two problems, First one is that when my iPhone goes under 20% battery it starts behaving abnormal and the battery sudden falls to 7,8,9,5. And the second problem is that my iPhone sudden shutdown automatically when battery is below than 20%.[...]"

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Troubleshooting iPhone Battery Issues:

Troubleshooting iPhone Power:

I. Perform a Restart:

A. Try Force Restarting your iPhone:

Save any information that need be. Then perform the restart.

Go Here: Force Restart iPhone - Apple Support

B. View the Battery Health Percentage:

Apple recommends you get a new battery, once the Battery Health reaches 80% or lower. When the Battery Health is 80% or lower, it is time for a new battery. Unfortunately, these if no way to know how, nor when, then percentage decrease occurred. So see if it tine for a new battery...

1. Go To: Settings
2. Tap: Battery
3. Tap: Battery Health
4. View: [the percentage]
5. Is it 80% or less?  If so, it is time for a new battery.

C. Try Manually Restarting your iPhone:

1. Go To: Settings
2. Select: General
3. Scroll to: the Very Bottom
4. Select: Shut Down
5. Slide Finger: to the Right
6. Wait: 30 Seconds
7. Power One: the iPhone
8. Try this Once More

II. A Few Apple Support Sites that May Help:

• iPhone Battery and Performance - Apple Support

• Charge and monitor the iPhone battery Apple Support

• About the battery usage on your iPhone - Apple Support

• About Optimized Battery Charging on your iPhone - Apple Support

• If you see "Your iPhone battery may need to be serviced - Apple Support

• Use Low Power Mode to save battery life on your iPhone - Apple Support