The GP-TAMICRO is a micro form factor Hotswap Shark-fin adapter that mounts directly to the existing 3-stud plate on the camera. It allows for continuous battery operation, and for additional accessories, it has 4 powertaps. Since the batteries aren't `stacked' on one another, you can easily remove the depleted battery while leaving the other battery connected so that there is no down time.
We recommend putting the second battery on about 10 minutes after the first battery.