Hello, http://wilcoxengineering.com/projects/amateur-projects/42-bat-pak shows some photos of a small battery pack. You might find useful with the KX1 or perhaps the K1. Cheers, Alan Alan D. Wilcox, W3DVX (K2-5373, K3-40) 570-321-1516 http://WilcoxEngineering.com Williamsport, PA 17701