Following reports earlier this year that Apple is likely to begin including a higher-power, 18 watt USB-C power adapter with 2018 iPhone models, [Mac Otakara] (via 9to5Mac) now reports that due to supply constraints, the new adapter will only be available bundled with the actual iPhone models, and not initially available to be purchased separately. According to the Mac Otakara report, Apple’s manufacturing partners will be running at full capacity…