A lithium cell sits inside the back of the case, and a button on the shell decides when it feeds the phone. The TPU body takes the corners and lifts the edges clear of the screen and the camera glass. Refilling the case itself takes roughly two to three hours.

A power bank is two objects plus a lead between them, which is why it usually stays in a drawer. A case is already on the phone, so the top-up happens while you walk rather than when you get home. It is also the case you were going to fit anyway.
The charge you did not plan for, already on the phone.

Fill the case before you first use it, and press the button when the phone runs low rather than leaving it on all day. Pick the variant that matches your exact iPhone, since cutouts and the connector differ per model. Slip the case off every so often and clear the dust from around the port.
Choose your model and keep the phone running.
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