I thought a bit about the gear I'm carrying around right now and realized that in my quest to lighten my daily load, I may actually have made things HEAVIER by going from a 13" MBA to a 12" MB and adding a 26,000mah power bank for my MB and my iPhone. Admittedly, I've used the power bank to charge my MB just once, and that too when the MB's battery was still full and I wanted to make sure the power bank wasn't defective. However, it's been used extensively to charge my iPhone on the go. This has led me to wonder the question in the title: assuming you do the exact same tasks, can the 13" MBP last longer? My tasks are not terribly intensive - word processing, creating outlines, YouTube, retro games via emulation (which I do only at home anyway connected to power). EDIT: I know that the MBP is more futureproof down the line, I was focusing on daily power drain. Both the MB and MBP are rated for 10 hours of usage. To rephrase my question: from a full charge, if I spend four hours typing the exact same report in Microsoft word, and watching the exact same videos on YouTube via Safari, will the remaining battery percentage be the same?