What type of batteries are you using? I suspect NiMh AA batteries. Have you checked the voltage of each cell? Have you tried cleaning the contacts on each cell and the battery holder? If you have a MAHA C-9000 battery charger you can check the condition of each cell. If you are using an EN-EL4(a) what does the battery life meter on the camera read? Good Luck and Enjoy your Nikons!