My 2008 showed the same symptoms in around 10K early last year. I luckily checked the output of the regulator before I put a new battery in. The regulator was the culprit, with a new battery and regulator all is good.
A link to my battery singing in a SS bowl on the driveway, I too was lucky to get it out of the bike without incident.
http://950 SE Battery Venting Gas