Like most electrical devices laptops have specially-designed batteries and battery charges designed to use an exact voltage and amperage and deviating from those values can be bad for the long-term life of the device, but if you're in a bind or just want to study electricity you can wire together a series of AA (or even AAA) batteries to power your laptop.
Electronics weblog FunnyHacks demonstrates in the video above how you can wire AA batteries to an adapter plug that will plug into your laptop's power plug and provide anywhere from 30 minutes to four hours of power depending on your laptop's power load, how many batteries you're using, what kind of power output those batteries have, and how you have them wired. You'll need to a bit of calculation to make sure you have enough batteries to meet both your minimum required voltage to power your laptop and enough amperage to last long enough to get your work done using a mix of series and parallel wiring setups.
Of course we're not actually recommending you use this hack on your current laptop as it's possible to short out your power supply or do even greater damage, but if you have a still-functioning laptop that's over a decade old with nothing better to do it may be an interesting project to try as it'll help reinforce basic electrical knowledge and fits into the MacGuyver book of "things I'd like to know how to do but not necessarily ever do them" that many of our readers enjoy learning.
Running a laptop off AA batteries | FunnyHacks
Source: http://feeds.gawker.com/~r/lifehacker/full/~3/eiU3s0f4tc8/power-a-laptop-with-aa-batteries
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