I just purchased a GH2 with a couple lenses and accessories from Adorama. While on the phone, the guy told me that the spare third party battery (half the price of the Lumix battery) he was selling me would work fine with the camera, and it has a longer life than the stock Lumix battery. I have read countless posts from people about third party batteries not working well with the camera, but they all seemed to be from 2010 or 2011. Is the third party battery actually going to work do you think? Or should I call him back before it ships and have him swap out the third party for a spare stock Lumix battery? Thanks!!