EE STATED THAT HE WAS CHANGING BATTERIES ON THE NO. 13 SCOOP. HE STATED THAT HE HAD UNJOOKED THE JUMPER CABLES AND INSEERTED THE SCOOP POWER CABLE INTO THE CHARGED BATTERY RECEPTACLE, WHEN HE HEARD AN ARC FROM THE SCOOP CABLE. AS HE ATTEMPTED TO UNPLUG THE CABLE FROM THE BATTERY HE SLIPPED AND FELL STRIKING HIS LEFT LEG AGAINST THE FRAME OF THE SCOOP AND SPRAINING HIS LEFT ANKLE.