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Does anybody know anything about external laptop batteries?

October 14, 2012 6:52:07 AM

I'm going on a three week camping trip and I would like to use my laptop everynow and then. I have an asus G53JW gaming laptop. the battery is 5200mAh and this is what I don't Understand.

8Cells : 5200 mAh 74 Whrs

Power Adapter Output :(  where does this fall in on external batteries.)
16 V DC, 4.7 A, 150 W
19 V DC, 4.7 A, 120 W

any advice would be helpful. willing to spend up to 250.00 dollars thank you.