Want to get a bit more battery life out of your Eee PC? The current generation of batteries come in 4400 and 5200 mAh varieties, which tend to die after 2-3 hours of use. Asus plans to sell a 6-cell, 7800 mAh extended battery soon, which should give you a bit more power. But if you don’t feel like waiting for Asus to begin selling extended batteries, you can pick a 3rd party battery on eBay today. Best of all, there are already 3rd party batteries with capacities up to 10400 mAh, which is reportedly enough juice to power an Eee PC for nearly 5 hours.

Asus hasn’t announced pricing on its extended batteries yet, but plans to charge $99 for a replacement 4-cell battery. So it’s probably a safe bet that the 6-cell version will cost a bit more. These 3rd party 10400 mAh batteries, on the other hand are available for about $64. They ship from China, so you may have to wait a little while to receive your package.

Note that the extended battery does jut out from the back of your computer, which will probably make it hard to fit your Eee PC in its slipcover or other tight-fitting case. But that seems like a small price to pay for a battery that can double your time away from a wall socket.