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I'm also at 3.5-4 hours, mostly with wi-fi on.
Quick observation though.. IF we assume a linear relationship, and for ease of calculations... 1000mAh = 3 hours ( 333mAh/hour) then the 1800mAh extended battery should be good for 5.4 hours or so...call it 5 hours 24 minutes. Course, the HP website ALSO shows a MONSTER 3600mAh battery for the 41xx line as well, but I think it's really for other units--the design looks as though it wouldn't fit the 41xx. but think of it.. 3600 or darn near 11 hours. (10:48 and change)
For a road trip, or extended wifi session, etc, what a deal that would be! Anyone else see that 3600mAh battery? Anyone ordered up the 1800?
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