Battery complications

Pune, India
October 1, 2010 7:30am CST
While buying laptop, manufacturer told me that this laptop has 5+ hours of battery backup. I started using it, frequently keeping it on SLEEP mode. My friends say that, SLEEP mode affects battery backup of the laptop. So, I wanted to know, to get a perfect battery backup, my laptop should be on SLEEP mode or everytime my work is over, I should shut it down??? Help me friends, I don't want to ruin battery of my laptop...
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