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How to completely discharge iPhone if it randomly turns off?

I have a problem with my battery - the phone randomly turns off. As far as I understand I can try to calibrate it - I have to charge it on 100% and leave on one-two more hours. And then to discharge it until it shuts down. But the problem is that it turns off randomly and doesn't discharge completely.

Is there a way I can do it? My only idea is to remove battery and connect it, for example, to a small bulb, so that the light will be on until the battery will discharge. Will it work or there will be the same problem because of bad calibration?

P.S.

Can't buy a new battery right now.

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今あるものを使い続けましょう

オールインワインキットで安く修理して、節約しましょう。

iPhone 修理キットを見る

今あるものを使い続けましょう

オールインワインキットで安く修理して、節約しましょう。

iPhone 修理キットを見る

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Hello Andy,

Sadly, you cannot just connect your battery to a bulb to fully discharge it then charge it again and hope it works again. Firstly, because iPhones uses different connections to connect to the phones motherboard compared to normal batteries like AA or AAA, you cannot connect the battery to a lightbulb. Secondly, because batteries run on indedendent cycles of collection of electrons and releasing them to charge the phone (extra sciencey stuff), the battery cannot "recognize" a full charge. Your phone does that in its software. Throughout the phones lifetime, when you charge it, the battery loses some of its ability to hold a full charge and proceeds to get weaker and weaker. But either way, the battery will just need replacing. Because you are on an iPhone 4, the battery is really old and thay is why you are most likely having issues. Since the phone is so old, it may only he holding less than or equal to an 80% charge of its original capacity. So, unless you can get a new battery, you may need to upgrade your phone, or live with the issue.

Hope this helps!

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Andy Black さん、ありがとうございました!
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