Flashlight that works with different batteries

    The idea is to create a flashlight that can use any number of almost any type of battery, ensuring you're never left in the dark.
    The flashlight will accommodate AAA, AA, C or D batteries. The batteries will be loaded into a container that can be rotated to select the battery or turn the flashlight off and on. The more batteries loaded into the device the longer it will operate, with the maximum run-time estimated at 86 hours.