The recommended battery brands for the COOLPIX B500 are Duracell and Energizer. You’ll want to make sure that you’ve selected the correct battery type that is being used in the setup menu. To do so, press the MENU button, navigate to the setup menu, and select Battery type. The three options available are Alkaline (default setting), COOLPIX (NI-MH), and Lithium. Highlight the battery type that is being used and press the OK button. If this does not resolve your issue, please contact Nikon Support.