I see lots of posts on here about Batteries but most of the threads are bogged down with battery problems.

I wanted to know if there are any (3rd Party) 8 cell replacement batteries out there for 15inch late 2007 and early 2008 macbook pro's that last longer than the OEM Battery.

I'm looking to UPGRADE my battery NOT simply replace it, although my Apple Info is telling me, "Replace Now!".