is there any danger if I plug my iPhone 7 or SE into a Samsung Fast Charging USB charger? The Samsung Fast Charger's output is listed as: 5V 2A or 9V 1.67A. Or how about just any Samsung regular phone charger that's rated at 5V 2A? Both Apple USB chargers that came with my iPhone 7 and SE are only rated at 5V 1A. Thanks!