Is the battery in the first gen uMBP 15" unique to that model or also shared with the 13"? I'm looking at the prices on the first-gen that are dropping fast, but I'm also thinking about keeping the machine 5-6 years and I'm wondering if 3 or 4 years from now you'll even be able to get decent replacement batteries for these since the model run was so short.
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First gen uMBP Battery - Will they be available long?
- Thread starter sclough
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Yeah don't worry about it. As the above poster said, you can still get Powerbook batteries from Apple! 
Well, the Powerbook G4's had a much longer product run than the unibody and there are a lot more of them out there. You're probably right though, I suppose Apple will support them for a while. It just feels now like the unibody from October, even though it's still a great machine, was a revision 1 product and that the current one will have a longer life span. Of course, seeing as it's technology what's a "long lifespan" anyway, right?
I bought my 15" uMBP in May 09 - and am very happy with the decision - I do not fear battery availability to be an issue as long as I own it.
Assuming the internal non-user changeable battery works out.
If problems crop up with that battery, you may see an upgrade in the future to a replaceable battery. I hope not, we are about to buy at least one, and possibly two new Apple notebooks. ( 13" MBP )