To test the battery today we put the machine through three sets of real world situations. One as a media movie lover on the move, a person wanting to watch HD media on a train journey or bus with two thirds screen brightness (any less and quality suffers). Secondly as a business man, using the machine for productivity with wireless enabled and balanced power settings with a mid way (around half) brightness setting. Thirdly as a gamer on the move, with the nVidia solution fully active and screen brightness up high.
The battery life is actually quite good, averaging between 3 and 4 hours under most conditions. When gaming, this drops to around 2 hours and 20 minutes.