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I have an early 2010 MacBook Pro and get around 4-4.25 hours running normal work activity off the battery. You'll want to cut back on screen brightness and if you're not using Wifi, turn it off. There is also a slider to control 'spin down' time after inactivity when you're running off the battery. I've noticed the operating time has dropped in the past (nearly) 2 years.
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techweenie | techweenie.com
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