There are so many options available beyond Apple's own iPhone charger it's almost discouraging. That $10 to $15 USB-C cable you found in a convenience store might work as a temporary solution ...

Plugable's USB-C Power Meter a neat little accessory that displays charging stats. It's arguably useful and inarguably fun.

In contrast, the iPhone 15 Pro and Pro Max feature faster charging with up to 29W and supports USB 3.2 Gen 2x1, delivering data speeds up to 10Gbps. Depending on what USB-C cable you buy ...