The XC Hybrid operates on six AA alkaline batteries (see fig. 1), and the XC Hybrid Stainless uses six C batteries (see fig. 2). A battery carrier is supplied with your controller. Insert the batteries as indicated on the battery carrier. Connect that battery connector inside the access compartment to the battery carrier and insert the carrier into the lower left side of the controller as shown. To access battery carrier on the XC Hybrid Stainless, remove the screw in the top center of the controller and swing the facepack down as shown in figure 2.