If your iPhone battery is suddenly dropping, you will need to fix it by recalibrating your iPhone battery.
iPhone batteries will lose health over time, so older iPhones will not show an accurate percentage.
Once you recalibrate it, it should fix the read-out of your battery percentage.
On newer iPhones, iPhone 11, 12, and 13, this process should be automatic. You can see it under the iPhone battery menu. Access this menu under settings and plug in your iPhone to charge.
Step 1: Drain your iPhone battery until your iPhone dies.
Step 2: Plug in your iPhone and turn it off to charge it. Do this overnight for a full charge.
Step 3: Turn on iPhone and force reset with volume up, volume down, and hold the power button.
Once the iPhone is turned on again, the calibration is complete.
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