As posted many times before, I purchased two Dell Mini 9’s on September 4th, 2008 which was the first day that they were publicly available. Both units have worked pretty much as expected so far.
I have seen battery run times somewhere between 3-4 hours on a full charge and had been quite impressed. As of last week my Mini running Ubuntu decided that it would no longer accept a charge. I swapped chargers, laptops, and batteries in order to verify that the issue was the battery.
Dell support replaced the battery with little hassle and it was on my doorstep within 2-3 days. I am not aware of any widespread batteries issues, but wanted to post/report about this just in-case others were having a similar issue.