Some people like to add battery grips for extra power, some like to add it for extra hand placement, some just want the aesthetics of a larger cam. Panasonic cameras haven't been big on external battery grips as much as Canon cameras, but tor those that opted in on the GH1 cameras, there's a battery grip available. Actually, to be correct it states compatibility with G1 G2 GH1 G10 cameras. Hopefully this will be a trend for the newer models. Anyone already rockin' these? You can find the grips available on eBay (click here).
Battery Pack Grip Panasonic G1 G2 GH1 G10