Question about Sony FDR-X3000R incl. finger grip

I have it and I am thrilled, the only criticism is that the battery has completely discharged itself after about 4 days when the cam is off. Does anyone here know if I have a problem, if so I'll have to return it under warranty. I have several batteries and it's the same problem with every one I put in. I haven't found anything on the net that addresses this problem. The battery in my RX 100 is still charged even after a month. So if anyone has a tip, please reply.