Rechargable Battery Power Supply?

Was curious if there are any rechargable battery power supplies out there, specifically I need a 12v 1000mah battery pack that can power a device while not plugged into the wall. Something I can charge and take with me to power other electronics devices that have the same input as my mobile pc
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More about rechargable battery power supply
  1. look into UPS (uninterruptable power supply)
  2. There are. In fact, I think Tom's did a roundup on a few of them some years ago. Sorry I don't have any links, but if you search on terms like "auxiliary battery" or "secondary battery" you might find some specific products.
    Here's an example link page:,or.r_gc.r_pw.r_qf.,cf.osb&fp=b001bd3a40637c26&biw=1280&bih=834

    And, here's a specific product. Note the variety of voltages available, plus 5V USB:
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