I haven't timed how long it takes to charge the Mavic Pro remote using the USB port on the power brick (when you're not charging a battery, which DJI recommends). But I have noticed that when I charge it via one of the USB ports on my iMac or with a 12 watt, 2.4 amp Apple charger, it charges noticeably more quickly--not to mention, you can charge it at the same time you're charging the batteries. Can any of you electrical-type guys confirm that the brick provides less power?