TenaciousDre of the
Eeeuser forum has made a DIY 12-cell battery for his Asus Eee PC 701 from old Li-On cells from an old laptop. Upside is the battery lasts for 12-15 hours with hardcore settings. Downside is it is quite large plus it takes 12 hours to charge.
Schematics -

The finished mod -

More details and photos
here.
Hope that it will work for the hours and hours. my laptops' one got discharged within three hrs.
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