'Good' news: it's not the battery. 'Good' being a very relative term here.
Bad news: it's my camera. The guys at the shop say it's a 'known' problem. Well then I say they fix that problem even though my warranty was up a couple of months back!
Super Bad:Estimated time to repair. 4 TO 6 WEEKS! That's practically a lifetime. Especially since I have volunteered to shoot a wedding in about 3 weeks.