The average notebook battery lasts about 3 years. Its capacity goes down slowly over time and will need to be replaced. They can tend to be pricey, so make sure and shop around.
The battery time can vary from notebook to notebook. On average, a HP notebook battery can last anywhere from four to eight hours on a single battery charge.
The Dell Latitude D610 Notebook has an average battery life of 4 hours depending on power settings and applications running.
ampere-hours
The notebook battery is an important feature to consider when buying a new notebook. The type of notebook battery included by the manufacturer determines the laptop's battery life. Most notebooks come with a 6-cell battery, but a few notebooks come with a 9-cell battery. The higher the number of cells, the longer the notebook can function on its battery. Many laptop manufacturers allow you to upgrade to a higher-quality battery for an additional cost when buying a new laptop.
3 cell battery life is approximately 3 hours; 6 cell is 6.5 hours
Most notebook computer manufacturer shoot for 1.5 to 2.5 hours of battery life for a system with enough performance to replace a desktop system. For ultra portables (netbooks, etc.) the ratings go much higher.
The HP Compaq Business Notebook 2710p is rated at a battery life of 5 and 1/2 hours with a full charge.
Manufacturer estimate for battery life is 3.6hours.
The average battery life of a Sharp mobile phone is 3 hours when it is used on an average daily basis. The battery life of a phone is determined by the way it is used.
The HP NB234UA Pavilion dv7-1243cl 17 Entertainment Notebook has an approximate batter life of 5 hours. The expected battery life for this laptop is 2 hours and 10 minutes.
Average life is from 3-5 years, assuming the battery is never run flat which will shorten it's life.
Generally notebooks have less RAM and storage than a desktop. A notebook may also have a short battery life, smaller keyboard, and a touchpad instead of a mouse.