DS-40 User’s Guide Maintenance Maintenance Replacing the Batteries When the Low battery light turns on, although you may be able to scan a few more pages, you should replace the batteries with new or fully charged ones. Note: You can use four AA size Ni-MH, alkaline, or lithium batteries. A Slide the battery cover to remove it. B Remove the batteries from the compartment. C Insert the batteries matching the positive and negative terminals of the batteries and the marks inside the battery compartment. 37