Currently Being ModeratedFeb 18, 2013 12:50 AM (in response to neimannj)
I did now try some system tools. They don't show the battery serial, too. I think, they rely on the system profiler's informations and therefore get no data.
When was this feature removed from OS X? According to posts on the internet the battery serial was show up to 10.6 but I never read about the App showing it on 10.7. What about 10.8 users? Do you see the battery serial?