In a first for iPhones, Apple says the iPhone 8 and 8 Plus can "fast charge" from 0 to 50 percent in 30 minutes. That is, as long as you have a specific kind of Apple power adapter (29-, 61-, or 87-watt) and a USB-C to Lightning charging cable -- both of which are not included. Still, it's a nice bonus if you have the right equipment, but most iPhone users have noticed that earlier iPhone models would generally charge faster than normal if you used a higher-wattage plug than the one that came in the original box. So the question remains: How much faster does the iPhone 8 Plus charge compared to the iPhone 7 Plus? We ran our own tests to find out. A video posted to YouTube shows an iPhone 7 Plus charging nearly as fast as an iPhone 8 Plus using Apple's 29-watt power adapter and a USB-C cable. Even before we began testing, that didn't seem to make any sense. Fast charging requires special controllers inside of the device and power adapter to transfer mo...