So what you should do is find a few laptops that meet your battery life requirements

A: Battery life is one of the most important selling points for new laptops. there's currently no special buzz words that the laptop computer promotion geniuses use so you will must look at the process specs & then do some research to figure out which laptop computer has the best battery life.
how can i figure out which laptop computer has the longest battery life?
The first thing you should look for is the manufacturer’s claimed max dell inspiron 1000 laptop battery life. you can safely compare the battery life numbers between models that are created by the same manufacturer but when you begin to compare numbers from one manufacturer to another then things will receive a small tricky.
So what you should do is discover a few laptops that meet your battery life requirements, based on the manufacturer’s claims, & then you should visit Bling.com or Google.com & search for reviews to see what people are saying about the models you are interested in. The estimated battery life of a laptop computer battery is much like everything else that is estimated (gas mileage of a automobile & pages you can print with an ink cartridge for example), your actual usage will make the number vary so the reviews should give you a better idea of what you should expect from actual world usage.
By reading the reviews you should be able to figure out which models actually live up to the claims of the manufacture & this will help you narrow the choices down to a few. From there you will must figure out what else is important to you. For some people it's the weight, others might be the screen, & yet other s how the keyboard feels.
As of this writing some laptops that claim the best battery life are the Dell Latitude E Series which claims a max acer aspire 7520 battery life of 19 hours & the Lenovo X200s series which claims around 12 hours.
keep in mind you can always tweak your battery life by turning off services you are not using like Bluetooth & WiFi. you can also increase your battery life by lowering the brightness of the screen as well.