A mobile point-of-sale system includes a cart frame and a battery housed in the cart frame. The cart frame includes a front having a bottom, a back having a bottom edge and a bottom. The bottom includes a pair of upper flanges and a lower housing. The pair of upper flanges have components for receiving wheels for supporting the cart frame and the lower housing includes at least one aperture for venting heat from the battery that is supported by the lower housing. At least a portion of the lower housing and the battery are located below the pair of upper flanges and are located below the bottom edges of the front and the back.