External laptop batteries are an extension of a laptop battery. They provide additional power to your laptop allowing you to operate your laptop many hours over your typical run time. Many of the external laptop batteries are made to work with many different laptops, and not just a certain laptop.
In fact, many of these external batteries are made not only to work with laptops, but basically any electrical device and can usually charge multiple electronic devices at one time. However, you will need to look carefully at the device as this might not always be completely true.
Tips on shopping for an external battery:
Many external laptop batteries claim that they can charge any laptop. Ensure that if that is indeed the case, that you don’t also need to purchase accessories for the laptop charger in addition to the external laptop charger. More than likely, you won’t need adapters between different laptops, but you might need different adaptors between different devices (such as a different adaptor between an iPod and a laptop).
There are many advantages to purchasing an external laptop battery. First of all, an external laptop battery will give you the ability to extend the life of your laptop. However, unlike a laptop battery, an external laptop battery won’t require that you power your laptop down. Your external laptop battery simply plugs into you’re a/c plug just as if you were plugging into the wall. An external laptop battery, over just swapping out an internal laptop battery, will most likely allow you to operate for a longer amount of time. External laptop batteries are larger (typically 1-3 pounds) than a typical internal laptop battery, but they also pack a lot more power..
While there are advantages, there are a few disadvantages depending upon your use. First of all, an external laptop battery is more expensive than a typical internal laptop battery, but it also stores more power so that is to be expected. The other potential disadvantage is that an external laptop battery is another few pounds to carry. Depending on your current weight load, this might not be a big deal.
Overall, external laptop batteries have a lot to offer and will be a compliment to the laptop bag that most people already use.