Laptop batteries can usually just serve you a few hours of mobile computing. Depending on the brand and model of your laptop, an average lifespan of your full-charged gadget can only serve you two to four hours.

If you are a very mobile person and your life and work is dependent on having things done on your laptop, it is most crucial that you have your bag packed with an external laptop battery.

After all, you can never tell if the next meeting or venue you'll be rushing to can offer you an electrical plug where your gadget can recharge.

There are things to consider when buying an external laptop battery so as that you can actually get your money's worth for this extra accessory.

The first thing you must consider is the manufacturer. It is most expected that if you purchase the battery from the same manufacturer as your laptop, you can expect good quality, not to mention secure compatibility of your gadget with it.

But do consider third-party manufacturers also. If you are a tinker and once have decided to open the case of a genuine Sony laptop battery, you will realize that the products used inside the case have actually been manufactured by Toshiba, Panasonic or other Japanese manufacturers.

While the brand of your battery boasts of quality, do consider the offering of the third-party producers as well because they are normally cheaper.

Also, they usually offer better warranty as it is their way to win new customers. Do not settle for a few months warranty. One-year warranties do exist.

Check the type of battery. In the early manufacturing years of laptops, most run on Ni-cad battery types.

Today, it is considered primitive and outdated given the presence of Ni-MH. However, if we are speaking of "long-life," the best batteries are those Li-Ion or Li-Poly types. These two are the most advanced and definitely more lightweight.

Check the power rating in terms of volts, watt-hours and/or milliamperes. You need not be an engineer to figure this out. Just remember: the higher the figure, the better.

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