It's all too easy to tear through your laptop's battery. And with MBP's battery built in, its not exactly easy to replace should you be careless with its lifespan. I know Apple says it'll recharge 1000 times, but I don't want to waste any of 'em. What are some good tips for making the most out of the battery? Like, letting the battery drain completely before recharging it, not leaving it plugged in, etc...?