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Power without the plug
While you might have a two- or three-year warranty on your laptop, your battery is generally only covered for one year.
Two specs to look for in laptop batteries are capacity (measured in milliamp hours, or mAh) and the number of cells. Typical batteries have an mAh rating of between 2000mAh and 6000mAh; higher is better. Cells are the actual compartments where power is produced, and can range from four to 12; the more the better. Keep in mind, though, that this may cause the battery pack to stick out from your laptop in potentially awkward positions.
Some laptops don't have easily swappable batteries, in an attempt to cut down on physical size and to lengthen battery life. Be aware of this — and when your battery dies, you may need to take your laptop in for a service rather than simply swapping the battery out yourself.
On the other hand, some can take a second battery, either by replacing the optical drive or by placing a shim on the bottom. Check your accessories before you buy.
Tiny, tinny sound
Laptops are notorious for having terrible speakers. While a lot of laptops these days are including some version of Dolby, THX, Beats or other sort of "branded" sound, this is done in software, and often paired with such tiny speakers that it doesn't make that much of a difference.
Our recommendation: get a good set of headphones, or a stereo or 2.1 speaker set. You can even get speakers powered by USB if you want something portable that doesn't require a power point.