The battery in question, NP-FW50, I just bought, do not hold the load as well as the one that came home with the Sony Nex 7. After you have loaded it shows 91% load at instead of 100%, and it takes much less of course! In addition I have some difficulty to remove the device, and is lighter .... Sony - NPFW50 - Battery for Camera NEX5 / NEX3 SLT A33 / A55V ....