How to Calibrate iPhone 5s Battery Meter:
1. Use your iPhone or iOS device till you fully drain the battery till it turns off
2. Recharge your iPhone or iPad uninterrupted until you achieve 100% charge. This will calibrate your iPhone battery meter. Power on pushing top button.
3. Lastly Power off by pressing & holding the sleep/wake power button on top of your device. Swipe to power off.
4. Power back on and you are all set.
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