I bought an MBP-R to replace a 2007 iMac. I primarily use the computer as my desktop and have it plugged in. As per Apples website you shouldn't leave the computer plugged in all the time and the battery ideally should be drained and charged every so often. I've also read that you drain and recharge the battery too much it will kill the battery as well. I know on PCs there is software that will allow the battery to be used every so often so the battery gets some use and doesn't go bad. Is there anything like this on the mac?