Has anyone experienced sudden immediate discharge with their batteries? I'm using Nimh rechargeable AA's. Took a trip to Japan and had AWESOME use of the batteries while there. When we came back, all 12 after charging are suddenly discharging after 1 or 2 photos - if I'm lucky. My camera shop will test them for me to see if it's the batteries (bought new ones first too) but is it possible that this is an issue with the camera discharging them?