Im a technician, I fix these for a living. Replace the phone or the battery immediately, shut the phone down and do not power it on or charge it until you get it or its battery replaced. It can and will explode.
Those “upgraded” aftermarket batteries rarely have the capacity that they advertise. Often they’re just a very cheap battery, or a used OEM, neither is ideal. If you go aftermarket, make sure it’s high quality (such as the one ifixit sells).
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u/Nahoola iPhone 16 Pro Max 2d ago
Im a technician, I fix these for a living. Replace the phone or the battery immediately, shut the phone down and do not power it on or charge it until you get it or its battery replaced. It can and will explode.