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2017年9月22日发售。型号有A1864,和A1897，可选GSM 和 CDMA 网络，存储有64GB和256GB，颜色有金色、银色和深空灰色。

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iFixit battery turns of randomly in my iPhone 8 Plus

Yesterday I have replaced my iPhone 8 Plus’ battery with an iFixit kit. The repair went smoothly, but I have realised an annoying issue:

Yesterday, I have used the device normally, and around 15% the device shut down. When I plugged to the charger, it showed 11%. Then I charged the device to 100% to start the calibration.

Today, after I have plugged off the device around 9 o’clock, and around 8 pm, the device turned off again with 50% charge.

Then I plugged the device to my Macbook, the iPhone booted back, and I launched the CoconutBattery. According to iOS, the iPhone’s battery was only at 12%, but the CoconutBattery showed 46%.

Should I try DFU mode and do a fresh install of iOS 15? It will solve the issue? Or the battery is bad?

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You should try the fresh install, maybe the software is just being strange or something. If you have a multimeter maybe you can try reading how much power is in the battery when it turns off, maybe it's just not reading the percentage correctly? Sry I'm not a professional when it comes to repair...

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There is something wrong with the gas gauge circuit. This circuit tells the CPU all about the battery health and charge. When one of its components fails it will produce the symptoms you are seeing.

If you can I would put the old battery in again and see if the problem is the same as the battery is the first thing you need to rule out. You also need to make sure the connecter on the logic board is clean and the battery connector is seated properly.

The most common cause of this on the 8 series after a battery replacement is nudged components. There are a number of tiny components around the connector that if nudged will produce this problem. You will need to examine around the connector with some magnification.

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I've used further my device, and I realised little interesting issue: when the charge level reaches the 50%, then the device will turn off. Maybe that could be a wrong battery too, but I will arrange a repair appointment with an independent well-known service, where repair technicians have board-level repair skills.

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