I'm relatively new to DMF and have a question concerning my 645DF+. Do I have to use special AA batteries to get the camera and back to work properly. I'm asking since I ran out of battery during a shoot and could not charge the rechargeable battery. So I tried to use the AA battery holder, but I only got DB issues, i.e. the giles could not be written to the DB (Leaf Credo 60). I got home, charged the rechargeable battery and everything worked properly after that. So back to the original question, do I need special AA batteries to get it to work as a back-up? Thank you for your insights and shared experience! Cheers, Chris