You have a Apple iPhone 16 that no longer holds a charge the way it did when it was new?
Your Apple iPhone 16 shuts down unexpectedly?
Does your cell phone only work when the battery is plugged in?
Those are common symptoms that a defective battery will have.
It is time to get a new Apple iPhone 16 replacement battery.
The old battery in your cell phone can swell inside and damage the internals.