Hi, my name is Erik. I'm looking to buy an m3800. I am currently deciding between the 61 Whr and 91Whr battery. Because the 91 Whr battery takes up the space for a standard 2.5 inch HDD or SDD, only an mSATA SSD is left inside the laptop. For someone who has experience with the computer, is giving up this disk space worth the extra battery life? mSATA SSD's are expensive, and my only other option for more space would be an external HDD which are slow for editing video and such.