Jump n Carry (JNC 4000) Battery Jump Box Broken Plug Fix and Internal Battery Replacement

My JNC 4000 battery box plug terminals broke. One terminal was loose and actually pushed into the face of the jump box. In this video I show how to fully disassemble the box, and rebuild the broken plug using a discarded wall adapter from another device. I also show the internal components and how to replace the lead acid battery inside the box when it stops holding a charge. In the end, a broken jump box is fully repaired.