My SP3 has about a 4% battery wear level after about 6 months use (hard to say because my current SP3 is a refurb). Anyway, I am concerned that the battery life already can go pretty quickly, and if I get the battery wear level to 10 or 15% which I guess could happen in a couple years, what's the best way to prevent that? I have always heard to drain your battery down all the way before charging it again, however, I can rarely perform this. I'll be in tablet mode for a couple hours on the couch and then go to bed with 50% battery and then when I get into the office, it's on the docking station all day charging. Which begs another question.... should it be on the docking station or on a charger all day..? Does that degrade the battery over time? Should I not over charge it? Should I not charge it over night if at all possible? What are your thoughts and inputs and findings to extend the battery life as much as possible....?