External Battery Pack?

I was wondering if there are external battery packs for laptops. I don't want a second battery for my laptop. I want something portable that I can plug my laptop into when the battery gets low. If I am in the middle of something, I don't want to be forced to turn the computer off and switch batteries.

I have searched the forums and also the internet. I haven't been able to find anything at bestbuy or newegg.

Thank you,
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More about external battery pack
  1. ^ That will work, but it's rather inefficient, as it uses your notebook's AC adapter. (There are probably also some quirks on the DC-AC inverter in the external battery pack that may not be desirable to put your notebook's power supply through).

    Anyway, if your notebook has a docking port, most of the time manufacturers offer extended batteries for those machines.
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