These days it is common to get a choice of battery, this is because most people that have a mini laptop are going to use while out of the office or away from home, so battery power is essential for staying in touch.
However, the difference between a three cell and six cell batteries when it comes to fitting it into a mini laptop is quite a lot as you can see from the image. Therefore, for users it is a matter of what do you what a flush fitting battery that only lasts a couple hours or a battery that sticks out, but lasts a lot longer.
Source [Liliputing]
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I often have to work out office with my laptop computer that have a good battery which can be used for a long time is really very important to me .
I find mine at Tradestead , there are many kinds of good quality notebook batteries that can meet my need very well , I like it very much!