Laptop Battery and Features

What does 6 cell battery mean and which feature do i need to look before buying laptop.

I need min 2 hours battery time and max 3 hours how much that will cost.

I notice dell is bit expensive than hp .. should i get acer , it has bad reviews or its just my fear.

Posted in wrong section, this belongs in the Computer Hardware section.

Dell is not a all expensive , u will get dell laptop betwoon 20,000-25000 , 2 hours battery time , Pentium 4 with excellent condition

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Dell is not a all expensive , u will get dell laptop betwoon 20,000-25000 , 2 hours battery time , Pentium 4 with excellent condition
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I am talking about brand new and never find 20k laptop of dell and i need intel core 2 duo