I followed Matt's reset instructions and it worked. Thanks
BTW, I found the same info on the Apple Support Communities site, with more detailed info on
Resetting the SMC (system management controller).
One difference I noted: Matt said hold down power button for 30 seconds. Apple said 5 sec.
For the record, I did 30 seconds.
It did more than remove that battery service light.
My fan used to also run excessively, and now that is fixed too!
Worth checking out: http://support.apple.com/kb/HT3964