My MB-D10 Battery Pack was working well with my D300 before. I switched to using the internal battery and left the MB-D10 on the shelf for the last few month. Now I'm ready to put the MB-D10 on for the soccer season. However, the D300 just refuses to recognize the batteries from the MB-D10, regardless I use regular AA size or rechargeable. When the internal battery is there, the dials on the Battery Pack do work. But the batteries on the Battery Pack don't. The only thing I can think of is that the electric contacts on the D300 got dirty. I didn't use the D300 in a rough environment the last few months and I did clean the electric contacts. Any ideas??