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We’ve seen homemade 9-cell batteries for the MSI Wind before. But now it looks like a major battery maker is preparing to sell a 9-cell battery designed for the MSI Wind netbook. Sascha at Eee PC News.de got a tip from a source saying that the batteries could be available as soon as November.

While I haven’t put these batteries to the test yet (or even seen one in person), it stands to reason that they should provide 8 to 9 hours of battery life, since an MSI Wind with a 6-cell battery can operate for 5 to 6 hours under typical use.

No word on how much these batteries will cost, or how much they’ll weigh. They do seem to stick out a bit from the back of the computer which is all fine and well if you want to elevate the keyboard. But if you want your netbook to weigh less than 3 pounds, you might want to stick with a 3 or 6 cell battery.