Anyone seen these? External battery for Macs & iPhones

I was pokin around online and I found these external batteries that can power your Macbook or Macbook pro for up to 17 hours and theres also a USB port that can power iPhones or iTouch's or anything USB.
you can check them out athttp://www.hypershop.com/HyperMac-External-MacBook-Battery-and-Car-Charger-s/91.htmlook really cool but they're definitely a bit pricy, anyone ever used these?
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my buddy has one, he seems to like it alot, i would pick one up if i didnt already have an extra battery for my macbook, but if you have one of the new unibodies they are great
 
These things are DOPE, I bought one right before my first semester of college and used it so much.. Really helpful to be able to only have to grab my macbook pro & hypermac in the morning and be able to use my laptop in all my classes, when I'm chillin / at friend's places / other places that I can't charge my laptop etc.. and have the brightness up / listen to music, etc.. and not have to worry about it dying.

I bought the 60 watt so it lasts maddd long.. Unfortunately now I'm dead broke so I think I have to sell it to be able to pay for skiing.

I listed it on ebay.. bought it brand new for $300... the starting price is $140 and buy it now is $175, pretty much half what it is on that site.. PM me if you're interested or simply place a bet on ebay.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180455796100&ssPageName=STRK:MESELX:IT#ht_500wt_1141
 
i have a belkin battery pack, it gives your ipod a straight like 7 or 8 hours of battery, but you can use it as a remote charger if you set your ipod to disk mode and plug it in
 
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