Laptop external battery power?

I am looking for the best external batter for my sales force to use.
I have been checking out the Valence N-Charge VNC-130 which runs about $299.
Anyone else know of anything better?
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grayeConnect With a Mentor Commented:
I've been very happy with the Smart Power Solutions 90 Watt-Hour external battery.  I use it for my laptop and tablet PC.  The US distributor is Lind Electronics
paulmmaloneAuthor Commented:
I ended up buying the Valence vnc130 external battery.  Seems to be working fine.
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