It didn't do any damage but compared to the OEM battery, they drained a lot faster. Rather than save the 50% in cost, I rather put that money towards the real deal and not have to think twice about it.Yeah, that's my gut reaction too. I'll steer away and follow my instinct. Thanks for reminding me to treat unusually cheap offerings with suspicion.
I found another http://www.hdewcameras.co.uk/panasonic-dmw-blg10e-2049-p.asp: I'm pretty certain is a 'grey' import, but should be the real McCoy.
Out of interest, what was the experience with the canon battery from eBay, did it cause damage?