I just bought an M3 and like it a lot so far. I'm still in the return period and debating whether to exchange it for an i5. I don't mind paying an extra $100 (8GB/128GB) for more power, but if I have to give up a lot of battery life, that would be a deal breaker. So my question is -- What is the difference in battery life/consumption between these 2 units? I realize it depends on the type of use. I mainly use it for travel, so that would be web surfing, email, YouTube video, etc. If there's only a 5% or less difference in battery life, I'll probably go with the i5. If the difference is more than 5%, I'll probably keep my M3. I've surfed the web for an answer to this question, but haven't found anything definitive.