My 2010 15" MBP (i7, anti-glare upgrade) routinely gets 5-6+ hours on battery -- unless I'm doing something that causes the discrete GPU to kick in. Then, I'm l

My 2010 15" MBP (i7, anti-glare upgrade) routinely gets 5-6+ hours on battery -- unless I'm doing something that causes the discrete GPU to kick in. Then, I'm lucky to get two hours.