Panasonic DMC-LS75 This is a question about battery life?

I got this one as my first digital camera. It only uses 2 AA batteries. A pair of Panasonic Oxyride batteries(longer life than regular Alkaline battery)came with it and it said that it should take about 250 pics. Well, I went through 2 pairs of those and 1 pair of Alkaline batteries to take 122 pics. Is something wrong with my camera? Or batteries? There were no leaks from batteries. It wasn't that cold outside. I turned off the camera as many times as I could, just like Panasonic recommended to save the power. I even took the batteries out from the camera each night. What did I wrong?