I have an iPad Pro and iPhone 5S. Is the iPad and iPhone adapter and cable the same? I have heard that the iPhone is 5 Watts and the iPad is 12 Watts. Is this true please? I am asking because I use the iPad with the charger I got with my iPhone and when I'm charging it and using it at the same time, the battery percentage on my iPad still goes down. Although I have heard reports of this happening to other people's iPad Pro's. Thank you.