To test battery life, we put the machine through a variety of ‘real world’ situations, mirroring the real world usage of a potential customer.
One as a media movie lover on the move (wearing headphones), a person wanting to watch high definition media on a train journey or bus with screen brightness two notches from maximum.
Second as a businessman, with screen brightness at a similar level. Wireless was enabled. A mixture of checking, answering emails using Microsoft Office, editing pictures in Adobe Photoshop and procrastinating with the odd sub-HD Youtube video.
Lastly as a gamer, playing a variety of games until the machine turned itself off.
Bad battery life is good, especially when viewing media, being able to watch three and a bit full length movies on one charge. Gaming suffers a bit, but an hour forty isn't bad for a laptop that's not focused for the task. Also, the game of choice was Titanfall, which would have pushed this laptop to its limit. With less strenuous games, you might have better results.
This Dell XPS is so cool