Thread: increase your laptops backup!

hello all
to increase your laptops battery backup you should disable all the eye candy.
and the most important
you see in ordinary laptops they contain usually a 6-cell battery (li-ion) which gives a decent backup of two hours but ..................there is another battery which is 9-cell(li-ion) battery which gives a whopping 4-4.5 hours of battery backup!!!!!!!!!!!!!!!amazing.
so if you the dough go and buy the 9-cell battery for your laptop

any idea about the cost & brand of the 9 cell battery? roughly