I've been using the Hi-Capacity brand MaxPower90 external battery for about a year now and it's been really good. I get around 9 hours of run-time (with power management set to AC power so my Vaio is sucking juice as hard as it can) and have not seen any decline in performance since I bought it. They make a few different versions of it with different capacities (and different prices). You can find them at http://www.ebatts.com/laptop_manufacturers.aspx/ Choose your laptop model from the list and the site will display all of the available batteries. Definitely bettery than carrying an extra internal battery which only gives me around 3 hours of run-time....
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doh! It didn't like the / at the end. Try http://www.ebatts.com/laptop_manufacturers.aspx my bad. Apparently preview is a good feature to use...
I forgot to mention that it also insulates my lap from the heat generated by the laptop, which is a nice bonus feature.
I've been using the Hi-Capacity brand MaxPower90 external battery for about a year now and it's been really good. I get around 9 hours of run-time (with power management set to AC power so my Vaio is sucking juice as hard as it can) and have not seen any decline in performance since I bought it. They make a few different versions of it with different capacities (and different prices). You can find them at http://www.ebatts.com/laptop_manufacturers.aspx/ Choose your laptop model from the list and the site will display all of the available batteries. Definitely bettery than carrying an extra internal battery which only gives me around 3 hours of run-time....