I only got about 3.5 hours on my SP1. While I loved it, I was paranoid about battery life. I had 3 chargers - one at work, one in the home office, and one that I took everywhere else. Battery management was ALWAYS on my mind. If I was going to sit on the couch and watch Netflix, I'd grab a charger. If I was going to take it to church for my scriptures, I'd make sure it was charged first. You get the idea. With the SP2, I'm getting around 7 hours. Now, the battery life estimator will change depending on what I'm doing from 2.5 hours to 10+ hours but I'm not always compiling code or doing Photoshop etc. I'm starting to get a feel for how long it will last given the way I use it. I can now watch a movie at night and not charge it and know that I'll still have decent battery the next day. I can start a project in office with 50% battery and not worry about it dying. Yesterday, I left for church with it at 30% and had plenty of power for scriptures and showing a video to my Sunday school class (I'm Mormon and we have 3 hours of church too ). I never worried about battery when I had an iPad. It's nice to get back to that feeling while still having a tablet capable of being more than a toy.