Help with buying a laptop.

Right so Im buying a Dell Inspiron 1520, and I saw it was 56 whr.
Now I’m not very good at computers, in this case laptops and I wasnt sure how long 56 whr was. If you know I want to know the approx battery life (without the cable ) of 56 whr and 85 whr. Thanks guys.
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Answer #1
u can find it on a good site i use,
www.notebookreview.com
there are many reviews there of your laptop
anyways i found it for you, its about 3 hours for the normal one, plus you could extend it with dim brightness and light usage to get 4 hours
here is a good review for u hope i helped
http://www.notebookreview.com/default.asp?newsID=3846&review=Dell+Inspiron+1520+Notebook+Computer+%28Core+2+Duo+T5250+1%2E5GHz%2F160GB%2F1%2E5GB%29
Answer #2
Thanks
Answer #3
Cheers Mate