Camera shops don't seem to have stocks of batteries that seem to be designed to fit only this camera. I found an internet ad for discount oem sourced batteries, and rang them to see if they really had stocks. They said "yes" and offered a discount if I visit the shop...well, I think that was the information I received, but couldn't be too confident as it was delivered in rapid-fire Thai.
So...I spent nearly 2 hours lost on the other side of the river as I tried to find the place. Eventually I gave up, pulled the car over and attempted to call the place for navigation assistance, even though I knew it was likely I wouldn't understand anything I was told...as I listened to the phone ringing, I glanced out at the closest shops and discovered I was parked right outside the place I was looking for...the dead giveaway was the plastic toy camera dangling from a string attached to the tiny shop's awning.
I handed over 1000 baht and walked out with 2 batteries!