So I got my new 2017 macbook pro 15 inch macbook pro in the mail today (YAY), but I've noticed static electricity on the surface of the macbook pro when I rest my hands on it. Is this normal? The Macbook Pro didn't come with an extension cable, which surprised me. I've heard the extension cable grounds better the electricity. So can I/should I use my 2010 macbook pro extension cable on my new charger?