I'd like to get an OEM battery since I heard that Panasonic puts the chip inside it to talk with the camera? I found some OEM Panasonic batteries that come from China but it'll take too long for them to ship here before I leave out of the country but the price is great!! So now I am thinking what if I got a decent quality third party GF2 battery? I just need it to make sure that I can still take pics while my OEM battery is charging up. I could care less about the battery life gauge as I know the OEM battery will be charged before I run out of third party battery. What brands of third party have you guys had success with and where can I get it within 2-3 days in the USA?