I'm thinking of getting the updated 12-inch MacBook with 512GB storage and 16GB RAM options as a home, travel and light-work laptop, since I don't want to be lugging around my heavier 2015 MBP everywhere. I'll use the MacBook for web browsing/email/writing, productivity software, light weight graphic design (Sketch), and web development (Atom, Docker, etc). Should I upgrade to the i7 processor for better performance? And does the i7 decrease battery life? Thanks!