So I recently purchased a new macbook pro with these specs. 2.4GHz Quad-core Intel Core i7 4GB 1333MHz DDR3 SDRAM - 2x2GB 750GB Serial ATA Drive @ 5400 15" HR Glossy WS Display I manually installed 8GB of RAM myself, which seems to work fine. Even with just basic web browsing etc, I only seem to get around 4 hours of life from it. 2-3 hours watching video. Automated graphics switching is on. I have calibrated the battery, so i'm not sure if this is normal. Is it? Thanks.