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That is an erroneous and misleading statement. Integrated graphics are not good for playing the latest games, but they will lengthen battery life and produce less heat than dedicated graphics.

I get very good battery life on my MPB, and it has discrete graphics. Aprox. 4 hours.
 
Yes, I know that. If the MBP had integrated graphics though, the battery would last even longer. Graphics cards take a lot of power.
 
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