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I've got an aluminum unibody MacBook Pro, 15", just over a year old. I sometimes do play games off of battery power, which I know is going to drain the batteries quickly. But how quick is unusually quick? With keyboard backlighting set to minimum (it won't turn completely off in Windows for some reason, at least in a dark room), screen backlighting at one notch, wireless internet turned off, bluetooth turned off, and volume at one notch (headphones), I can barely manage 45 minutes of Mass Effect II (via boot camp) before I drain a completely-charged battery.

Is this typical? Or is my battery losing its mojo? I remember with my old PowerBook G4, I had to get a new battery just about every year, and I'm wondering if I need to do the same here.

Many thanks for any input.

EDIT: As a tangent, in case anyone was curious, Mass Effect and Mass Effect II are good enough, on their own, to justify buying Windows XP and setting up a Boot Camp partition. What amazing games.

EDIT 2: I do have a wireless mouse plugged into a USB slot, which I guess might drain some power. Is this a significant amount? Should I dig my old corded mouse out? Or is this inconsequential to the MBP's overall power usage?
MacBook Pro 2.53GHz 15", Powerbook G4 15"
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MacBook Pro 2.53GHz 15", Powerbook G4 15"
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