Received my 15" rMBP today it's my first Mac and it's gorgeous. However I'd really love some information on the best way to help my battery have the longest life. To make things simple I've typed out some questions below which are my main queries. Would love any extra information you think I should know. 1. Should I drain the battery entirely and then charge it completely every time? 2. Can I leave it charging overnight? Does it stop charging when it's full, what if it begins to naturally lose power again, does it start charging again? 3. Should I just close the lid at night or should it be shut down when I'm asleep? Also if I know I won't be using it until the next evening should I shut it down or is sleep fine in this case too? 4. Is it bad to use the laptop whilst it's charging? Does it ignore the battery in this case and run entirely from mains power as I had heard? Finally, thanks to everyone at MacRumors for helping me to decide on my first Mac amongst many other things.