When you say it's in a boot loop, can you be more specific? There are a couple of types we see on iPhones; there's the one where you see the Apple logo on the screen for a while then it reboots. In the other scenario, the phone boots all the way up and then reboots every three minutes.
If you're seeing the second one, then the cause of the reboot will be logged in the analytics as a panic log. See @flannelist's excellent Wiki article on how to retrieve the panic log, then post the first page of the log here and we can help you diagnose the issue.
If you don't get past the logo, then you'll definitely want to try out the previous suggestion of putting the old battery back in and seeing if the phone goes back to it's previous behavior. If you don't have the original battery I'd suggest going ahead and buying an new one; there's always the possibility you got one with a bad BMS board.
It's only after verifying that the replacement battery isn't the issue that I'd have a serious look at replacing the lightning port flex assembly. None of those repairs are going to be too expensive, so they're well worth a try.
Note that starting with the iPhone XS, Apple began pairing the battery to the logic board. The only way to keep the battery health information available is to save the original Battery Management System (BMS) and solder it onto a new battery cell. Unfortunately it will still have the old battery information unless you plug it into a device programmer, something like the QianLi iCopy, and use that to reset the cycle count and health percentage.
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=== Update (07/06/23) ===
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@korhit That is a possibility, but the only flex cable that runs under the battery itself is the wireless charging coil and the volume buttons that share a connector. Try unplugging the wireless charging coil and see if that affects your ability to boot. Here's a picture of the connector to unplug.
When you say it's in a boot loop, can you be more specific? There are a couple of types we see on iPhones; there's the one where you see the Apple logo on the screen for a while then it reboots. In the other scenario, the phone boots all the way up and then reboots every three minutes.
If you're seeing the second one, then the cause of the reboot will be logged in the analytics as a panic log. See @flannelist's excellent Wiki article on how to retrieve the panic log, then post the first page of the log here and we can help you diagnose the issue.
If you don't get past the logo, then you'll definitely want to try out the previous suggestion of putting the old battery back in and seeing if the phone goes back to it's previous behavior. If you don't have the original battery I'd suggest going ahead and buying an new one; there's always the possibility you got one with a bad BMS board.
It's only after verifying that the replacement battery isn't the issue that I'd have a serious look at replacing the lightning port flex assembly. None of those repairs are going to be too expensive, so they're well worth a try.
Note that starting with the iPhone XS, Apple began pairing the battery to the logic board. The only way to keep the battery health information available is to save the original Battery Management System (BMS) and solder it onto a new battery cell. Unfortunately it will still have the old battery information unless you plug it into a device programmer, something like the QianLi iCopy, and use that to reset the cycle count and health percentage.
When you say it's in a boot loop, can you be more specific? There are a couple of types we see on iPhones; there's the one where you see the Apple logo on the screen for a while then it reboots. In the other scenario, the phone boots all the way up and then reboots every three minutes.
If you're seeing the second one, then the cause of the reboot will be logged in the analytics as a panic log. See @flannelist's excellent Wiki article on how to retrieve the panic log, then post the first page of the log here and we can help you diagnose the issue.
If you don't get past the logo, then you'll definitely want to try out the previous suggestion of putting the old battery back in and seeing if the phone goes back to it's previous behavior. If you don't have the original battery I'd suggest going ahead and buying an new one; there's always the possibility you got one with a bad BMS board.
It's only after verifying that the replacement battery isn't the issue that I'd have a serious look at replacing the lightning port flex assembly. None of those repairs are going to be too expensive, so they're well worth a try.
Note that starting with the iPhone XS, Apple began pairing the battery to the logic board. The only way to keep the battery health information available is to save the original Battery Management System (BMS) and solder it onto a new battery cell. Unfortunately it will still have the old battery information unless you plug it into a device programmer, something like the QianLi iCopy, and use that to reset the cycle count and health percentage.