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The iPhone battery is basically difficult to replace by the user.
But detachable batteries were commonplace in old cell phones. Why did Apple make iPhone batteries "non-removable"?
*Category：Technology Technology｜*Source：Apple Explain ,Wikipedia
Why the iPhone Didn't Have a Removable Battery
Removable batteries are a very useful feature in that you can restore battery life simply by replacing a depleted battery. But Apple never put a removable battery in the iPhone.
The biggest problem with detachable batteries is that they require more components and take up more space. But if the battery is non-removable, you can simply stick it on with glue. It can also be shaped as Apple desires to optimize space.
This represents Apple's thoroughgoing stance to pack as much functionality into the device as possible and aim for a compact size. For example, some iPhone 13 models use an L-shaped battery. This allows us to pack more capacity than a rectangular battery.
Another problem with removable batteries is their water resistance. Batteries that can be easily attached and detached have a problem that water can easily enter.
Also, the benefits of removable batteries aren't as great as they were a decade or more ago. Advances in battery technology have allowed most mobile phones to last all day without charging. And batteries can sustain more discharge cycles than ever before without degrading.
Of course, there should be benefits for Apple as well. If you've been using your iPhone for years, you'll eventually notice a drop in battery performance.
But users can't replace the battery themselves, so they have two options: buy a completely new iPhone or pay for a battery replacement. Of course, Apple would want you to buy a new device, but it would definitely increase Apple's profits either way.