car battery jump starter showing ready to start vehicle ignition, 12v jump pack with led light, usb quick charge, under hood

accessory accumulator alligator assistance auto automobile automotive battery booster break breakdown cable cables car charger charging clamps clips close connectors corroded corrosion corrosive damage dead device dirty electrical emergency engine engineering equipment grips hand jump jumper line maintenance mechanic negative plug positive power problem recharge repair start starter starting terminals texas vehicle voltage