A battery receptacle system is provided to accept various types or sizes of batteries in different orientations. The battery receptacle system includes a first radial notch for positioning a first positive terminal of a first battery to electrically connect with the first positive contact at a first position, and a second radial notch for positioning a second positive terminal of a second battery of a different size and/or type than the first battery to electrically connect with the first positive contact at a second position, different from the first position. The second radial notch is configured to prevent the first positive terminal of the first battery from electrically connecting with the first positive contact at the second position.