Dell Studio 17 Battery doesn’t even last during 1 movie, its just very energy consuming. I use the laptop with it plugged in 80% of the time and do my best to ensure the laptop is cool. I always thought the best way to keep your battery aside, is to keep it completely empty, but some guy said 40 perentage is the best energy level to keep it stored. NEVER drain the battery to nill. Shut off the computer at 5% to be safe. Do not let the battery get hot. If your laptop is badly designed the battery sits next to hot components and then dramatic battery death like you experienced is expected. If the above is true, remove the battery when your not using it. If you know you don’t need the batt then store it in a dry room temperature place at 40 or 50% charge.