I was hugely disappointed with the 9 month lifespan of my original 6 cell battery that came with my I9200. It has been my ONLY complaint with this great (for my needs) computer!
So last month, after just plain getting fed up with being tethered to an outlet on a wireless laptop (!), I ordered a 9 cell replacement. It's been really great...long charge hold, I can squeeze over 3 hours of light duty from it. But due to my bad experience with the original battery, I've been monitoring this new one in anticipation of it degenerating just like the old one, all while scratching my head wondering about the claims by many that their batteries had given them 18 months of good service, or even more in some cases.
I had even done extensive on-line research on batteries just to try to find out what charging practices I had done incorrectly.
Well, I'll be getting a replacement in 20 or so days, and I'm THRILLED! -Happy not only that I'll get a back-up battery, but also that I can stop being paranoid about my present battery degenerating as quickly as my original did, now that it's confirmed that it was defective.
Good for Dell for making it so easy, too.
Hmmmm. Now I wonder if they'll send me a
9 cell...

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