1 Discharge the Battery
The very first step to calibrating iPhone battery is draining it completely of any charge. Usually, this can be done just by using it until it is devoid of any charge. If you are in a hurry however, you can drain the charge by maximizing on energy- draining functions. For instance, you can turn the flashlight on while watching videos on the phone. To make the process quicker, try streaming videos from the internet. Ignore the warnings that your phone battery is running low and continue using the phone until it goes off automatically.
2 Leave Phone to Discharge Completely
Even when the phone goes off due to lack of power, chances are there is still some charge left in the battery. Ever wondered why your dead phone registers that it's 2% or even 3% charged as soon as you plug in the charger? It is due to the residue charge that remains when the phone goes off. When you want to re- calibrate your iPhone battery, it is important to ensure that even this remaining charge is gotten rid of. This can be done by leaving the phone dead for a few hours. If you can, leave it all night long for the best results.
3 Charge Phone Till Full
Once you are satisfied that there isn't even an ounce of energy remaining in your phone, it is time to plug it in. There are a few rules you must follow here. First, the phone must be charged uninterruptedly until it is completely full. In fact, don't just let it charge until it is 100% charged; leave it for a couple of hours longer. Where is the sense in this, you ask? Apple experts opine that even when the phone shows that it's100% charged, there is still more room for charging. The 100% charged tag is only used to give an estimate of the phone's battery life.
Another rule you should follow is that you must charge the phone with an original iPhone charger. The importance of this cannot be overstated. Additionally, it is better to charge the phone when it's off. Since it cannot show how charged it is in this state, give it roughly five hours to be completely charged.
4 Warm Restart the Phone
After the phone is fully charged, now you have to warm restart it. First, you have to press the sleep/ wake button in order to switch the device on while it is still plugged in. To warm restart it, simultaneously press the home button with the sleep/ wake button until the Apple Logo comes on.
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5 Remove the Cable
The last step to calibrating your phone's battery is to remove the power cable after warm resetting it. If you notice that the phone still has a jumpy battery, then you will do well to simply replace it.
6 Do it Again
Calibration works best if done at least twice. Repeat the whole process again to completely cure your problematic battery. It will prove to be worth it in the long run.