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What kinds of laptop batteries do you need?
by King Lorry
Simple as it may sound, batteries are the biggest differentiator between laptops and desktops. Unplug a desktop from the wall, and it shuts down; do the same with a notebook, and it might last a day (or so HP and Dell claim with their 24- and 19-hour batteries, respectively). Or, more realistically, anywhere from 90 minutes to 9 hours.
Regardless of capacity, all new notebook batteries are made up of lithium-ion cells and are rechargeable via A/C adapters. While some manufacturers make it more difficult than others to remove the laptop battery, most make it simple to pop them in and out. This opens up the possibility for mobile professionals to tote a spare battery (sold separately). However, you are better off getting one battery that lasts a long time than lugging a spare; extra batteries are bulky, and you need to shut down your computer before inserting them.
In choosing or configuring a notebook, you may be presented with different laptop batteries sizes and capacities. We can help you decide which one is right for you.
How Much Battery Life Do You Need?
If you plan to use your notebook away from your desk, you will want a bare minimum of three hours of endurance (with four to five hours being preferable), because even when carrying a notebook around the home or office, being chained to an outlet is extremely inconvenient. If you use your notebook in public places (coffee shops, outdoors, planes, etc), you want a minimum of four and a half hours of endurance (with six or more hours preferred).
Choosing the Right Number of Cells
While there are batteries with two, four, or eight cells, most come in three-, six-, or nine-cell packs. If long battery life is important to you, always choose the the largest number of cells available. Whatever you do, don't settle for a three-cell laptop battery; notebooks and netbooks with three-cell batteries tend to get less than three hours of battery life. Batteries larger than six cells—often referred to as "extended batteries"—may add some extra bulk to your notebook, sticking out the back and adding a few tenths of a pound to the weight. However, if you need long endurance, this extra weight is worth it.
Measuring Battery Capacity
While battery capacity is the most important factor affecting battery life, you can't tell just from the battery specs how long a notebook will last. Some notebooks are more power efficient than others and, even with the same notebook, users themselves can have a big impact on battery life based on the power settings they use and the tasks they perform. For example, a quad-core gaming notebook may get less than two hours of endurance out of high-capacity battery, while a netbook with a lower-capacity battery can last more than nine hours.
At LAPTOP, we test notebook battery life by running a custom script that surfs the Web continuously via Wi-Fi. See our "How We Test" section for more details.
About the Author
We sell cheap rechargeable laptop battery and ac adapter for most every notebook computer on the market.
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