I bought a couple of generic batteries today (DTI electronics) which are said to replace panasonic BN-V812/814U, VM-BPL13 AND VW-VBD1/B202, they look almost identical 99% so I put them inside the camera and started shooting, everything was fine until I tried to get them out, they didn't wanted to go out, they stopped halfway because the white spring you use for removing the battery gets stuck in one of the rear middle holes, it's not a big deal, I removed the battery just pushing the white thing with a screwdriver and put some sticky tape on its rear part and problem solved. Just a warning, try your new battery before you are in the middle of a photo session!!!
Hope it helps somebody, Regards.
Arnau