Notebook batteries consist of individual cells,such as a 6-cell battery. Is there any way to estimate the overall capacity of a notebook battery from the number of its cells? How much capacity does such a cell typically have? When selecting a notebook battery,such as hp pavilion dv6000 battery HP/Compaq Pavilion DV6000 Battery 12-cells 8800MAH Description: Cell Type: Li-ion, 12-cells Voltage: 10.8V Capacity: 8800MAH UL certificated cells inside! http://www.udtek.com/hpcompaq-pavilion-dv6000-battery-12cells-8800mah -p-20875.html manufacturers will often list an amount of “cells,” where each cell has a certain capacity; thus a 9 cell has 50% more capacity than an equal model 6-cell battery. That is useful for comparing directly, but the story is more complex if you wanted to compare different batteries on different laptops. Batteries have a voltage rating (V) and milli-Amp hours (mAH), which, if multiplied together, give you milliwatt hours. For example, a 14.8 V battery with 4460 mAH gives you 66,000 milliwatt hours (66 watt-hours). You can compare laptop batteries this way, but also keep in mind that different laptops have very different power requirements that vary based on the components and how well the operating system manages power consumption. Typically, bigger, heavier batteries will give you a higher watt-hour rating. A 6-cell battery may be the same form factor as a 9-cell, but the 6-cell will weigh less since there’s less chemical in it to hold onto that charge. If you are a mobile warrior, you will want the most cells and/or most watt-hours you can get into your model so you can go 5 or 6 hours without a recharge. It is so painful to run out of power before you are ready. ” And here I suggest you a online-shop to buy good notebook batteries.My friends have bought from udtek.com .There are many computers hardwares on udtek.com. She thought it’s a good service , fast shipping shop,and high quality shop.May be it’s good idea for us to see what products we need .