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Well the 700 pages you mention, 10 days?
That's about what I'm getting!
The trick lies in finding the right battery. A higher capacity battery (eg a 2500mah one) does not always mean a longer battery life. It generally means you can have a bigger powerdraw for a short time, without the battery being over-ballasted.
The trick is to find a high quality battery, often made in Japan, not china or korea!
I have bought a 7200mAh 11V extended battery from china for my laptop. The first 3 charges it truely had more juice (upto 6 hours). Now, it has the same amount as Sony's original 4400mAh battery, though both are used as much as the other!
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