GP-S and GP-A
The A-GP-S is a temporary solution to allow the use of V-type batteries on 3-Stud configured cameras. It can also be used as a charge adapter, enabling you to temporarily charge V-type batteries on any 3-Stud charging equipment. Same for the S-GP-A model.

GP-TS and GP-TA
The GP-TS Hotswap adapter mounts directly to the existing V-Type plate on the camera and allows for continuous battery operation. Because the batteries aren't 'stacked' on one another, you can easily remove the depleted battery while leaving the other battery connected so that their is never 'down' time. It can provide up to 380Wh at only 7.5lbs.
And also the GP-TA