This could still be a faulty battery and is where I would start for sure, but really I think what you're asking a bit of how an iPhone knows how much battery charge is left.
Essentially there are a few parts to this. There is a net of sensors and electronic components on the battery management board (a small circuit board within the battery), and on the logic board, which use information about the current and voltage being transmitted to calculate the amount of charge left in the battery. In reality it will always be an approximation based on math. The estimation is only as good as the data it's getting.
An issue with any of the sensors, or connection between the sensors and wherever they're trying to send data can cause all sorts of problems. It might mean wildly fluctuating battery percentages, inability to power on even if the battery is fully charged (because perhaps the phone doesn't think there is enough power to get through the startup sequence) or the battery saying it's 80% when it's nearly dead.
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The iPhone 11 Pro and Pro Max add a bit of additional complexity because there are in fact \ 2 battery connectors. One is on the logic board and one is part of the charge port cable assembly. A large part of the charging circuitry is on the charge port assembly rather than the logic board proper.
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The iPhone 11 Pro and Pro Max add a bit of additional complexity because there are in fact 2 battery connectors. One is on the logic board and one is part of the charge port cable assembly. A large part of the charging circuitry is on the charge port assembly rather than the logic board proper, meaning that could also be faulty.
That's a lot of extra information, but the TLDR of that is, ***this could absolutely be your battery*** and I would definitely start there.
This could still be a faulty battery and is where I would start for sure, but really I think what you're asking a bit of how an iPhone knows how much battery charge is left.
Essentially there are a few parts to this. There is a net of sensors and electronic components on the battery management board (a small circuit board within the battery), and on the logic board, which use information about the current and voltage being transmitted to calculate the amount of charge left in the battery. In reality it will always be an approximation based on math. The estimation is only as good as the data it's getting.
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An issue with any of the sensors, or connection between the sensors and wherever they're trying to send data too can all sorts of problems. It might mean wildly fluctuating battery percentages, inability to power on even if the battery is fully charged (because perhaps the phone doesn't think there is enough power to get through the startup sequence) or the battery saying it's 80% when it's nearly dead.
+
An issue with any of the sensors, or connection between the sensors and wherever they're trying to send data can cause all sorts of problems. It might mean wildly fluctuating battery percentages, inability to power on even if the battery is fully charged (because perhaps the phone doesn't think there is enough power to get through the startup sequence) or the battery saying it's 80% when it's nearly dead.
The iPhone 11 Pro and Pro Max add a bit of additional complexity because there are in fact \ 2 battery connectors. One is on the logic board and one is part of the charge port cable assembly. A large part of the charging circuitry is on the charge port assembly rather than the logic board proper.
That's a lot of extra information, but the TLDR of that is, ***this could absolutely be your battery*** and I would definitely start there.
This could still be a faulty battery and is where I would start for sure, but really I think what you're asking a bit of how an iPhone knows how much battery charge is left.
Essentially there are a few parts to this. There is a net of sensors and electronic components on the battery management board (a small circuit board within the battery), and on the logic board, which use information about the current and voltage being transmitted to calculate the amount of charge left in the battery. In reality it will always be an approximation based on math. The estimation is only as good as the data it's getting.
An issue with any of the sensors, or connection between the sensors and wherever they're trying to send data too can all sorts of problems. It might mean wildly fluctuating battery percentages, inability to power on even if the battery is fully charged (because perhaps the phone doesn't think there is enough power to get through the startup sequence) or the battery saying it's 80% when it's nearly dead.
The iPhone 11 Pro and Pro Max add a bit of additional complexity because there are in fact \ 2 battery connectors. One is on the logic board and one is part of the charge port cable assembly. A large part of the charging circuitry is on the charge port assembly rather than the logic board proper.
That's a lot of extra information, but the TLDR of that is, ***this could absolutely be your battery*** and I would definitely start there.