If you want to have a notebook with a proper laptop battery you need to buy a brand new one,

FOR IMMEDIATE RELEASE
(Free-Press-Release.com) January 9, 2011 --
Take Care of Your laptop Battery

When you get a new laptop everything is working perfectly given that you've got the good fortune and it's not dead on arrival. Then things start to wear and tear, here's a crack, there is a dent but the battery often dies rather fast, and that's not a natural consequence of age. Lithium-Ion batteries die on their own, but not in the one year time frame some people manage to kill theirs.

If you want to have a notebook with a proper laptop battery you need to buy a brand new one, people usually say something like this when they give tips to their friends. I'm not telling you here to buy an used or second hand notebook, rather trying to give a few tips on how to keep the battery in its original shape even 2 years after you've bought it.
that way you're lifting off its base from the surface allowing better airflow.

In my own non-representative experiment I used a notebook that always shut down because it overheated. Using some better thermal adhesive between the heatsink and the core I managed to get rid of the problem but that's not the point; under full stress during a Prime 95 Small FFT test I noticed that laying flat the processor went all the way up to 82.4 C, while just with a CD case put under the back edge I managed to shave it down to 78.5 C. Four degrees Celsius with not even half an inch lift. Lithium iun loses about 10 % capacity in a year stored in 25 degrees, while in 40 degrees, which is normal during operation, it loses up to 25-30%.

It makes perfect sense to get a notebook cooler but you don't really have to buy one, common sense and paying some attention makes a big difference when handling a portable computer. Another thing you might consider to prolong the life expectancy of the unit is to store it half charged whenever you're not using it.

Lithium-Ion cells hate three things above anything else that you can and should do anything about; heat, being completely discharged and being overcharged. Avoid them and you'll have an internal power source in your computer that has about 80% of its original performance rather than 40 minutes tops.More battery info: http://www.laptopbatteryinc.net.au
http://www.u-battery.co.uk
http://www.all-laptop-battery.co.uk